Malicious PDF — malware analysis report

Static analysis result for SHA-256 1805f6c258e22dd8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 18:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9eb8ec2820122f6f6be1d372977734fd SHA-1: ecd93b6bd0969d04c7d1bbae5662e53e42b7aabe SHA-256: 1805f6c258e22dd80bc76c180614a2e3f066eb7531c5eaeb2bdd760adc72ec9a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The high-risk heuristics and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to download and execute a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://alvitraders.com/files/denasawitulasujekulu.pdf In PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3c9f5e7052388c6e2e274d8f7d0f3fce/nitiloxexoposumosedipamo.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/83771538733.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/63945038279.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052115094373499.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jepiguj.pdfIn PDF document text
    • https://codecs.ro/images/file/73286788520.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/93715316482.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4466b4b05cbbac2ac225a40e7dc568f6/koriwuzovomevopesufovo.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/sekafunupugunifurugan.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nakorum.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/garomebiputenuloxekigusip.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6m1j4miq14aemjl88etvo1v0i9/gabalat.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/40940151474.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xivujojuxes.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6e522343---mazinorasepumakanixit.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/96802100208.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160859a38686dc---fusufetaj.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nepuwenudomevisawajog.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ded8d98d046da495b02b0796601bcbf/rijeta.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c84587ac---31075243423.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/42764573856.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jqlq4vts30e4gc3o04csldrkhc/kejukegetirekewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=d-link+dir-882+ac2600+manualPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 10860 bytes
SHA-256: 7b8fff77812537473655618d33de2cfbb313d3a803f147244600f99b3e4b7083
font_01_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 17096 bytes
SHA-256: ad44a8bc36e17b46f768802eed29c78a6e9d9de0941389944044aeaba78b83fc

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