Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cbe4ff11037ee0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 18:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a96b9bf4d1c40d03ef0524da4da84b7c SHA-1: 533e0a3cab1848c90bd42c01c4ee6490d5fff6ad SHA-256: a0cbe4ff11037ee08ab4bcc26ec9f8feb1ccecded7f5e190c987a2784b18d42e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. These URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=eppendorf+centrifuge+5418+r+manual PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c36b22843930d8259a4b56f7c35f9d9d/1148782068.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/33026614327.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2d5e718f---tigodiz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfdb7e2597---rerezunoxibu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/60284539493.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610309c2bd006---kimabexojokigisuwega.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/71792f3736be5d99160396003d8a1c92/64154052899.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/70604802608.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c98b80f117dcaacc153496262005590b/sududesivefib.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e4bea546641f2e87691c3d1f8212bdc4/selogil.pdfIn PDF document text
    • http://candientushinko.com/images/file/gukifusegajopisi.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/34615412530.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/94660468766.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/14554987113.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee70e6b45---jotisimavozumeret.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/8981515948.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2b9984d6---dogiwimux.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebf12304b---tiwadetuv.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/zarita.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/dojuja.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b43cb452---94563657850.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tubozuf.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/msiqjucmi0gbee27r299a24tn5/vuxinalune.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_off0000bed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 17640 bytes
SHA-256: 525e0f208e41e6a9d2542e88cbca1d78af2246fadf86ea16910f38e62cbf9b01
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 11352 bytes
SHA-256: 29fa166216cc7b58e8830447abc034592be12809951599b83a1e0ac531c3f455

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