Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143c7ed071a0a41…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14187d6a19c70d97d89c6a3379adfe82 SHA-1: 86985fe4b385bbf76083e49cd87098b91ee98cf3 SHA-256: 8143c7ed071a0a41482ff7081b5ad7718b094c05f2cf9ee1c59a07f9a8cd3ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://trendymamy.pl/userfiles/file/15516024427.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kf0f5rt332iltm5a0fgtbrf8n2/84549608721.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b745f314870---37374164557.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a3385aef8a0d4b179a878998412ec9f1/gizodelegitov.pdf
    • http://lapawan15.com/shop/fck_file/file/nusapaxajevewasigivepixip.pdf
    • http://www.victoriousintl.com/new/resource/files/minojoxaxuvezejag.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/91658830333.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f073c9902a---muximanigijulafulevexigev.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c74fbce44e917e56e2ea1d552203cd51/mopefotimotalazaxazoko.pdf
    • http://massageindex.nl/images/uploads/dufetinu.pdf
    • https://motiv8workout.com/up/files/xepifaf.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9a9f78ed1315515d1881bec3dd93339b/fokujixexajabezune.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/972e886fcbe71f79a23b7787041c2d40/27404836567.pdf
    • https://euro-commerce.bg/files/46357157916.pdf
    • http://shiksha24.com/userfiles/files/64343212158.pdf
    • http://aps-mes.com/files/file/zininezimunijagexapewusi.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3ae0lg2nbm67t2ijgrf9c5f1h3/22603510076.pdf
    • http://aggengr.com/uploads/CMS/file/39347541888.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8e5d3b582ae0ea3bf0fd0d9019cb6597/worijudujumagukodito.pdf
    • http://tipiland.net/upload/file/galajolapawere.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/425a6b21a6cf5cc785ed10ec4d0d2a06/zoxapirabifukuseri.pdf
    • http://studiobardinisrl.com/userfiles/files/xomaxazukaxolotonarap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=interfaith+marriage+in+the+bible
    • 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_off0000e6b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 16792 bytes
font_01_sfnt_off0000fec6.bin
02d1d69ce1609708c65ff1ac2eb54be1f0d9438bda3c9ff5cf7cd1a12037a750
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 16804 bytes
font_02_sfnt_off00012a59.bin
7ba4c72cc46c8a0bf5d7e95d0c0e4bc0fdf3d561d95c10328a1ce934912fa727
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 10464 bytes