Malicious PDF — malware analysis report

Static analysis result for SHA-256 858cad549b15bfe6…

MALICIOUS

PDF

89.4 KB Created: 2021-08-21 02:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d283a39fcc87ed3c08f462bc8cd5f98 SHA-1: b3aa3a9669448f3086eca6859b94733ef53b7d77 SHA-256: 858cad549b15bfe6632f49ce4eb9922682b33ec42819edf9acdd40aae5cec1a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to host malicious content or redirect users. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or social engineering attempt, likely to trick users into visiting a malicious site or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a52854dc7---7458022502.pdf In PDF document text
    • http://splogservice.ru/content/files/ginejuxekomude.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad211a735b9---manufilufamebo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839465672ae---kekewirazalol.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608362cfc7b5b---65504266305.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3710d0a9---84584469389.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/62243437448.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/86734725829.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/majobamazop.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/norirapopajeganel.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/96637170735.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965bc5f37ee---13442017342.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7e6d89e6348db9ae71d1151b67d87806/37032249847.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/86322254470.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04f4311fc---73203384089.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/93684178539.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/308356934.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecf23372e---53820329640.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/89486447530.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/52504003007.pdfIn PDF document text
    • http://esistore.be/userfiles/file/9476652075.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/niramipigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cbs+sports+franchise+football+manager+cheatsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 17780 bytes
SHA-256: c68add58e4461a680fc7469a546da11c3049c5aaa17fc2a1360bd089753ab279
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 11096 bytes
SHA-256: 75d37c0fbdf4167c26564025a15fabde2eb723cacae2c42e096f6d02a9c3c550
font_02_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00013de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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