Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0e6ba4bd2d8fd…

MALICIOUS

PDF

88.5 KB Created: 2021-08-08 21:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff9dc6c2f12ca709c1307acc8515d1d6 SHA-1: 977d5d45c2b734e55ebeabe2f67951e3752f4d96 SHA-256: e7f0e6ba4bd2d8fdafb2e949e8fc0e6d99c34495cc3fd1e076b27b937b1e50e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond its PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ebe9735e6df86e4bbab115b12c513a02/26395685582.pdf In PDF document text
    • https://svetplus.com/userfiles/files/84728729266.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mirijofa.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/muzovuzazefijoba.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kujoxej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090f45da043b---piwiva.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1cbaaae7---79998619590.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/67714324936.pdfIn PDF document text
    • http://exosushi.com/uploads/files/zexinug.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/85870305883.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/lumekuligo.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/pukeriwukir.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853f2ed08---13234684560.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/benubanu.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45261978760.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/53006759799.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/535bc9aa8cb2a89e3cb22a0694e2cb7f/bazixebenet.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/65905011134.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ggr1f3mkdj9iur526dlnbr7uqt/bugipimijagefebilunisu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8023a6478c81040e6efbeb1bcd72511a/povidapaxipelatalerijikid.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/51785201673.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/421b83863e6077af9ba581dbe661428f/53501860294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=importance+of+ethics+and+morality+in+human+lifePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca38c8a29---1043943908.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45925d2de00468311873d20468e88d2f/56150883047.pdfIn PDF document text
    • 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11052 bytes
SHA-256: 6d080afdf94b07139e28993e203bfccf86a5efd69f354904f3cb0e664d21b879
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16324 bytes
SHA-256: 49a17af83bbe964ac8e2a7fa74a6df937a27cdec0ccb751e6ec60930fe8e09f6
font_02_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1