Malicious PDF — malware analysis report

Static analysis result for SHA-256 8657b2fa3d89353d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 13:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0a385372aa0ecc07ded5f671e3ee87b7 SHA-1: 94b2692db335894ede0cf8c37062e50d7e6d987a SHA-256: 8657b2fa3d89353d13b91141882c227dce5c42dc7b7301cd507bbb750ae0de71
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number presented in a context designed to trick the user into calling, consistent with callback phishing or tech-support scams. The presence of numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting further supports a malicious intent, likely to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dbf5997e583e9061e307ca0c7aad6597/gijiselegulex.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb4c7fe5f618e382da683f7896eda/suvisuwigoba.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/nalixepiwatitavowefekuj.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/22497202134.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3e4ee516---5779812155.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/v48gdalm2a05enneb12l9loho3/79706767100.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/47126421682.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e7a885a974406856cf17a4adcafae3fc/fetukekidadu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1cvg5rap905ogt9h104vvrhqh3/wolupigigifozexuzisunap.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/18966104851.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/48ee35cb774906e0b985507276b5be3b/rumozelaweras.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/61679669155.pdfIn PDF document text
    • https://bachson.net/upload/file/wewoxiwupeje.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-18/images/files/92155872573.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/vuxodaxopoxaxosedewisidas.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e0563bdc---97420288863.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/sajazibejelovi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d61a4f5ae1e2aa333e102aedd71b9ef3/fesefopuxugumeropi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62e66831c---9130982257.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/filupitedemipelaxo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d7696774d07a3fbab997a3b5b9010a3a/xagezotojudokakonev.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2931dc5a18cecfd779a623d956d655cb/nifaxov.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e63ce640746---39164275648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rccg+sunday+school+manual+10th+november+2019PDF 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_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 11652 bytes
SHA-256: 326a16c0982b9491b2ca3998d8c8927b739d8ebeb8c6d4e100279ebd8ab434d4
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 17456 bytes
SHA-256: 7a67ba215291c8b4444f12e0f99782b79bb141bee5b8440314b4df26b7e304dc

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