Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ac6b54cea41487…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 06:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eac28c9305219bad48701360edabca5 SHA-1: ad8cdd6a78b8336c270bee3c44e9c5261a4a31be SHA-256: 70ac6b54cea41487a916d05924252adf760fe46df80803a6d9cf358bb912867a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for information. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc6a2e1c0---30730083324.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d8f97c42---goruvizekopavadawinulagu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/77c11d635adcc062a65bfe836fd72200/jozawotape.pdf
    • https://bnovum.hu/downloads/litav.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/pabivurekawafupugowawami.pdf
    • http://vce34.ru/attachments/file/koniz.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/192e51bccc5affaaa7bc1d895995a4f0/76404783425.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160807d640880e---45048139205.pdf
    • https://ludifrance.fr/userfiles/file/rolopuleredegekuselivi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ebdc8726---51871376504.pdf
    • http://bigdoughpizza.com/uploads/files/97573902260.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160812c62404ce---pogejuwemikupuwopaxaje.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/0i515o80g38napqo5njeabnh9n/83186180993.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcccfe9d7f---miworikararibasejora.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4ceebb47b56933858137cf74b94d5959/50640293785.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a86e31f4485aacdecc6ee4f022c24d5f/wezij.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a6c2893d---powegewopapux.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/slnul9k2eual3ci805e4td0m8b/44293015986.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/aabfe161e0220da793d491126029c469/besigorepipejosose.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5b221e6fd57a1a33eacc5bd5ddd0fcd6/80433548576.pdf
    • http://moristas.com/userfiles/files/39299553169.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5727e2125c---59491668187.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a00abd25---70140720060.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818d82b4728---wolerejubafirevipud.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b885453c03c8bf6744dfa808c43664e5/70340016949.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=male+and+female+green+bell+peppers
    • 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_off0000ea72.bin
891feece48f434f6438a4bd8c9303e1162125cf8a9b340a09fbc3fda2751f769
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 15908 bytes
font_01_sfnt_off00011347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
font_02_sfnt_off00012b5e.bin
0e62732539d2ed03c0e9a8a76cbdb0fc6dd841ecdc99b3fec1ce4efef9ef0a3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 10664 bytes