Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e8e258191d39bb…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 00:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e985098148134686200ce08fd19f7d5b SHA-1: 01b6a42940c6cd7fdcf81a118cb8e1bd7ffc74ba SHA-256: 55e8e258191d39bbedaf3facf415abde2a46e53529481d068266ab05e26c8796
256 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of both advance-fee scams and MFA harvesting lures. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or credential harvesting campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific narrative, but the heuristic firings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/20294508513.pdf
    • https://antae.be/app/webroot/uploads/file/8409937258.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/980b7ba464686f978df61aa63684bec9/65186169481.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/g6fuskhspvskp8fpmpv9nmi11m/lazoxoru.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609846648c0a7---47558635615.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c6o23h4d1jh0u42v89khu8ituu/95009829434.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3a847d755e03fc2847f327191fafaace/zefoxamutavem.pdf
    • https://audit-advisers.com/userfiles/file/93349775868.pdf
    • http://aivieksteslaivas.lv/userfiles/file/25016562459.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac72618fb6a5ae22e6fa36ba6efbed48/gimagovij.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bidebukabezezuwujimid.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b500e584---meforiwedubin.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b48ae1e98c1665f678f2db75750b1c41/xunipenesusufamirerasov.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9cf197d1---29712712764.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eejdfijp3tc8gosgvsbdjqe0p1/8624795792.pdf
    • http://sotel-perm.ru/site/file/pibazuxezu.pdf
    • http://magicdiscoradio.hu/userfiles/file/sizuxegitopixi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gksp89937anstadkvl6t2jc6dj/25342476090.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba213298a---zatok.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/93706972801.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a25160f81f365fae3ca61cc223bace9e/zarorofifaravop.pdf
    • https://aokman-drive.com/d/files/xigilugozuko.pdf
    • http://pspectr.ru/userfiles/file/logotimerimodoxuxarimex.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/94b3ab209e9afdf98e2c8ef31da1c20a/4674400200.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+fill+a+form+sent+by+email
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ab.bin
d31d0306335a79b3bd6313154ded9c6e4e93214dba73c99f69d39497ed201c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10704 bytes
font_01_sfnt_off00010f41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
font_02_sfnt_off00012753.bin
0fd1868782373c7a9b0865fbb0e527884d7ff0d17ff5156b239bc7a581df7193
pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 17208 bytes