Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc520cc74935ba35…

MALICIOUS

PDF

98.0 KB Created: 2021-06-26 18:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830abcca4e0d00c13a61e9392c6621b1 SHA-1: ad45572b1739e0647559a9c069cc05288344f486 SHA-256: cc520cc74935ba35128456176c79d371d7b7dad58b12fee963f99156a45d2b68
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to lead users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56d89dd88---zikosapavusom.pdf
    • http://poltinka.ru/userfiles/file/tubakukosobo.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1620048161885.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607db400c2b6c---58931031122.pdf
    • http://mp-journal.com/media/file/vofowefapowigigujatupap.pdf
    • https://ludifrance.fr/userfiles/file/94931658767.pdf
    • https://soalmatematik.com/userfiles/file/sokejajeve.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/11c83ab402d90bbaa8bb0b9cee98a95e/niserebele.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/049710bf411ca6ad05e48eb0d6a0fc00/zeriwobalanot.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/33effbe65d2b312b3743ae742bf11e50/96845519213.pdf
    • https://sindonis.com/userfiles/file/gafirifabanitize.pdf
    • https://drvishweshwari.in/userfiles/file/xaxifomanurolurefikewej.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f73ad795b---78104457407.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d6ce1273f9b701997e635aec11f811ff/93296809471.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/bapesusadufenubuxifixakix.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f53d6c109591c61cee3acc5556461a9b/31804241096.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160766ab1e3e0e---damozuselila.pdf
    • http://stressmanagement-karriere.de/userfiles/file/dijeforukeborati.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/14c5f5751e26d4af98420ef5cd5ff4c6/rusuwivurugowuza.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bb56f203---76578834868.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e9184060---1571826248.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/371a0ade439440d645c322ce81951e2e/terefav.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7caaf9914f---96683731745.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c9327722---45234067872.pdf
    • https://calendarsunrooms.com/userfiles/files/wopoxuzulewi.pdf
    • https://communeouchamps.fr/userfiles/file/pemirubivonopelivogef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mod+apk+of+clash+of+clans+latest+version
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010431.bin
aa11163bba91015250040207e5d2cd2c85e97ae94f03b9512ce18cfd65053502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10868 bytes
font_01_sfnt_off00011d49.bin
75640fdca585d9f248f443ff3f19212795e80ecf1dd2b88374a882c8a3ee956c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 17052 bytes
font_02_sfnt_off000149af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149AF 16792 bytes
font_03_sfnt_off000161c0.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161C0 16312 bytes

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