Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b1ab880d3918e8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 01:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d578cc86342b799f3b40f626789b5e7 SHA-1: 09ea4cdbf881c21dc921dc532ea22f56ebdfd73a SHA-256: f4b1ab880d3918e84b5b4afc467c6b4b5853564ebb041fb000715914b8f976f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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.
  • 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://oniceh.ru/uplcv?utm_term=random+sites+opening+chrome+android PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b024ugvogfm19vr3g5lapaarm6/64020820920.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/gubipisesimaxobega.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/fivuwivene.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/96557595842.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/nuwitusezoxarig.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vivijezujaluwunugobixofo.pdfIn PDF document text
    • http://terryloops.com/E/file/51932821417.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24876447687.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///37764595803.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726541b8cc---67953577670.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/zeporokabamakut.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/pexizewafixikifeges.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d145eada34f2e11e79c87741677d210a/95830204735.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210911002754.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/28260056299.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/xobuwetabiwomidona.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/91790909006.pdfIn PDF document text
    • https://actor-conseil.com/files/file/34089564593.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/lapuruxowenaruzeveto.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///negenowifilujeta.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148289fc77dd---wuvekofowat.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/33803166701.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/ligadimosasogafolijiso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 15376 bytes
SHA-256: e98da9ad8a73f132848da34aa354e9f4a803cb9f45aad00f25252265ed7b4279
font_01_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 10960 bytes
SHA-256: e273220e95814382fc5329775fa1d6aceec2e801fabf820759c2bd1e7922e98e
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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