Malicious PDF — malware analysis report

Static analysis result for SHA-256 e345c76a4b773f4e…

MALICIOUS

PDF

72.2 KB Created: 2021-06-29 04:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68999a9ea2053ee859f0af245dca913b SHA-1: bd06ba447e5658b789c19d0adbaf6c1cb5be26a0 SHA-256: e345c76a4b773f4e0ff4f574f4bd30cb948db2c6a94bc2e9401ea40955d5b85f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/39e7bd03f1f17e80757007e6f0cf7771/61177463014.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/01e7831a7cabf0ca4ceca1ec0e902f27/96228035812.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091003dd94f0---1305025916.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/67788613964.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd40576f1---leseluf.pdf
    • https://betentour.com/sites/default/files/file/9597012280.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7fd44311c---53519931705.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf0b8652fe---wulamedepojopunet.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb665d266---34302142278.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4940e692ff---14276430567.pdf
    • http://akicgiyim.com/userfiles/file/85447102921.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/fd2acf38da92cafa53a82aef125edb82/tigebevevanapufusowazodof.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4d0s6s8s8qv08t5jra67q6e9i5/xigakomadivaf.pdf
    • https://kovosluzba-praha.cz/res/file/bexamatuwefarilo.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/682acacc7a70bca53b1183ff96c43be6/52781008401.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ddc0f0b5dfc83c4592fda4e6deb8e73b/34033501745.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20034503834.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe403cb874---tenam.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ce604d0d0cf9e5659e92b49afbac85a8/lopukafesevaxixuxada.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e112ce96ba---14853703415.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be836f4bf---54700849547.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hh45o4c20pqc8l9qq77k1fihb0/68861751723.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81413445700.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=concentration+of+ions+in+solution+worksheet
    • 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_off0000bac1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 16792 bytes
font_01_sfnt_off0000d2d8.bin
f7c89bc32682687abd7b4ef92bf07732595992564ba21c5d558358cc36c0a2f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10744 bytes
font_02_sfnt_off0000eb94.bin
78182cbc7c827f8da11280418465eb5ac2ba24e5d0e049fbd3757fff1825723e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 15460 bytes