Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cf5ab91dd2c68a…

MALICIOUS

PDF

97.8 KB Created: 2021-07-05 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e8f9133f7aeed7c66c443a78367962d SHA-1: 181caf8ee536edfb0c459b93731ce02d6015191f SHA-256: 89cf5ab91dd2c68acb85da87bd3c854e18d6678c99ddc370e76760dee7257ef1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including a high number of links to compromised WordPress sites and disposable hosting, as well as a direct ClamAV detection as Pdf.Phishing.Trojan. The presence of a 'download' button lure further supports a phishing or malware distribution scheme. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=five+nights+at+anime+apk PDF link annotation
    • https://edenestates.com/ckfinder/userfiles/files/vibemesexoba.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dowubixofemumubixasapoj.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b66a6ed98f244dbe33792d97b518e2a/lasowiguvufasuferapate.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/visq7ar3tum5jl8r7kesmcihr0/59456324771.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6e99b0f6---sodukukubusezujonowenuseg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5hq4hav919jd8lju8hemcovah1/butadewobotatural.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaa3d6e0d---vanotozuzadagosuvimobule.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae5c63365---56317290257.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af2f1f9d7---pibaxitagivawovaw.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/60811962529.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210624002646.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d5c3a590---xutiwelosutagef.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fd3319cf---63387419428.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/98fqb7u1f6sb6ggcqd53uq1ps6/pomitum.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3233c5ac5a3847d4805d246acd8d6231/tubozasidazem.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/magowa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737488736d6---76693688861.pdfIn PDF document text
    • http://fotossc.pl/_files/file/zovetetuwuvoma.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492608c641---nekugag.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/17155505181.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d87c9f4a---zutuzesodo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nukataj.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dffbc650813---53111519254.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d2dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD2DD 20740 bytes
SHA-256: fb6bf94a97c259b00f123811c3d03902c4a260762b51341995c897f1ac60a213
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 28644 bytes
SHA-256: 904f13f55d67699c6dbc50c519bc7e115846c2da07c51b3c5fe05a8950f39346
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 3200 bytes
SHA-256: b4695dfed51f494d3e5aaaa92d883fea89281739b14d45a7e5a8c12ee1647a1d
font_03_sfnt_off00014936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001614d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614D 10568 bytes
SHA-256: 9eee517e324c1e18757f20864f16e205f0e09577224986c62590517a6768ba72

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