Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec8ba5e146104f…

MALICIOUS

PDF

79.3 KB Created: 2021-08-10 17:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc212327e702194e6af2aae478ddf41c SHA-1: c7f801f44518e2c777d4e8f41dad650bcd35b13c SHA-256: b3ec8ba5e146104fc9768bc4778e2d12fa72bcaea44f3660d1d00e04b166a94d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f180f236a---65707834006.pdf In PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dgc7kcv53qknmlo0iocsdo2u16/32925322610.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb24f4d2f9---42952157572.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86cc4a2ff---68225682255.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/78396982609.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gesejominesus.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/77196581860.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ea59cfc78b33c101d4757745ff034d77/xepewonejaguwefegave.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83261164465.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0f34b36c---guwilejofoxevava.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/17961513247.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/kokoduwurewut.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29227cd1da---86148255784.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dukelu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b430a92bc---buribikemabokibivotusiga.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dimonoziripovosoxulovoj.pdfIn PDF document text
    • http://lukinserv.hu/file/59382257301.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610081378b52b---pufepelorimividamudadopa.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3d953e600ba602aeff9d728521cf832d/65459975716.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/19214558709.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/nedesidodilejamub.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c918d562a5788c4e6ff0cc31284c41a7/14699988125.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/899370fbf6418c72c2cb47817078b1e8/buzex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609454ac81cf4---13076590324.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/futixidunifewukomumaxowi.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/12300819725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=first+aid+for+psychiatry+clerkship+5th+edition+pdfPDF 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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 17112 bytes
SHA-256: 7c890933d98e8e9cfa7b3e688c5bbe752628b4990a19740dfa9b1d998939c542
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 11036 bytes
SHA-256: 7d588e06993b90539481c68ae363d4495e4a34390aa41a951f449811a64e3b34