Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d89dcbdb5214626…

MALICIOUS

PDF

82.8 KB Created: 2021-07-23 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e838dbc48784da2ef24d829bac548fdd SHA-1: df8a70daec5840879a71973fc44c3ee6ad9386e4 SHA-256: 0d89dcbdb5214626e144e77ed113fee5c7dde42b83f6a5a3d999f638ea199bb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload sites and disposable hosting domains. The document's content, though heavily obfuscated, suggests a callback phishing or tech-support scam pretext, aiming to trick users into initiating contact via phone. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/37754929590.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846305dfb99---36882684900.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547b9d2c8a---midusagatulejijes.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/40909805624.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd5e9ca26---gidunitujibawusagajilin.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fujeredutolaloxedisejeze.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/47454404228.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dugekopededafoxezupe.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/bipidemi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a6e913d17ac1df91d2092d371a6a2308/fexabapakipikavug.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4c45f16fbcdcc3fc8a377b15261fbf2d/88365646074.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dunalewatalupe.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/bizixo.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/vonojepox.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/46283737767.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d3c3e5c70e622ac63faeec2286ee7a93/59648884945.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289861ebf6---danikeriraj.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a91a08819---34309478143.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/33528949014.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf4caba69---38829396287.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/xanerotokexigalemunuvud.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/50294988655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=format+of+simple+future+tensePDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10596 bytes
SHA-256: a26a4bb6d72f11c96cbd6924f8490150828b072775df54a861b5cf76c0f1f044
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 16880 bytes
SHA-256: 250cc1b39a0dd306e6f9747b48ce1a1337e2b3b0e55dfe256575add55013c9d3

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