Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f4702c9790f7a1…

MALICIOUS

PDF

100.3 KB Created: 2021-08-10 05:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 04b50bd0e783585373326c8f67a77b81 SHA-1: f29e070d09632554746b478cbbc8ab79b61c4049 SHA-256: a5f4702c9790f7a1724b38231f618d921365f50ea2857a5bec7dfe1a55659141
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is classified as malicious by ML models and ClamAV, and exhibits characteristics of a link farm designed to host malicious content. The document body, though heavily obfuscated, suggests it is part of a lure, likely for phishing or malware distribution, by presenting itself as a search result for educational materials. The numerous embedded URLs point to various compromised websites and disposable hosting, increasing the likelihood of a malicious download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=college+physics+young+9th+edition+solution+manual+pdf+free+download PDF link annotation
    • http://tiszaikaland.hu/upload/file/jovavodadax.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c6a1e6be1cf5c232b3bfacef0afdc1c5/54454240133.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/velipoganewaxopajupibibu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/htl839cd5fg5e4qjhfcianalo2/30739118641.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609354ff12496---todunajimi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/96d71b3b154f7cf85aac89581df49925/10619690256.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/76236001488.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jofifekixol.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c7bc3af5---miwigipirexulededi.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/21998133853.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/vezilewivemulerapilosin.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/xufodutovojavivixekiwe.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/75098089785.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0643859001622884411.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fca47e59a---29052012325.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160877f9c0c805---tidujiwitimewomux.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd756aa330d---xuzotunimijek.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ec58cfc2da8792974627505ae320e617/nitolivazedodede.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/95ae9ed0cd606578af3a456cf42d9394/82541923553.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111b4f435e0b---movivimirexoromukosor.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/pipopawivume.pdfIn PDF document text
    • http://compsult.net/userfiles/file/zuxijikoxabebuwilovawegim.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/41882475920.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_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 11564 bytes
SHA-256: ba1461c407735ab4ca8274a78d3d28d216da35e1998933a4cd2c058f32356da5
font_01_sfnt_off00013a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15216 18132 bytes
SHA-256: 1fb2f1ee95d358d39712ebbe6dfb02cc01eaf75ce74ffb9b1da460336f277257

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