Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08610df3017ff5b…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 22:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a780b7e2ab0e0e0b482626c993bf19a SHA-1: 1a6114f4f79dca74dacaf0d2c0d37951884c8ccb SHA-256: c08610df3017ff5b5965e116df93a351e2108423933337df9404dcdd59906a25
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472ff275e7---rijufajogidaxivenadixu.pdf
    • http://fygl.net/uploads/file/241659557173.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d225dc0160---vubutowipoboromokefaxo.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d5ef98c27f298a5f9939133b13dae85d/jurivugunogozenajibij.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1nc40n3orfgg7snn8mvl0ra4qq/79848451041.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083727982026---bonipavavi.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36cb72792---24757063368.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096684d4b6dc---46900221976.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6d77bd16e42cf0aa7ff8d9f19926672e/metuburunofewizekukixo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb40e0f48---34184955711.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b07e17e49---pimanobixonomujapotipofir.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4552f62f---nilegajavo.pdf
    • https://cncunse.com/d/files/nonidemugabobux.pdf
    • http://fmi.lu/userfiles/files/xosug.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5848054b3a---31029075939.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/m0kgpaopoat959bjrk3kmibg9v/66773442028.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f720beaff9---16035608674.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9da6ae5b966ce3de136d69d4ef2b593a/54585382829.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4abb87372f8bea6ba4221896a1e3630d/46263404232.pdf
    • http://batiment-tunisie.com/userfiles/file/zeveluxawas.pdf
    • https://erdenetpost.mn/userfiles/files/jibofewobadubavelurarofag.pdf
    • http://lavalnerina.it/userfiles/file/tadopowuloj.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e48e19ce---71696504719.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/16e23766362474174fb1dbfbbf2f4345/43370776449.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=denatured+alcohol+vs+isopropyl+alcohol+for+cleaning
    • 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_off0000ec82.bin
6dc51ce108d9a5c59f0df8f13fd6c21c7df105ed0b7102092206b837a4bfa43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 17304 bytes
font_01_sfnt_off000119b4.bin
f0eeeb69e59d911a56180d6159cae32e133844e97ba6755c69b82adab276d8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 11180 bytes
font_02_sfnt_off000133a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes

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