Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c643838ffc0cccc…

MALICIOUS

PDF

85.7 KB Created: 2021-08-24 23:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f805ce95651c749061372dd92bbf7697 SHA-1: 8f2a71dc112504ad2a92af8a6b8cec0de697b852 SHA-256: 4c643838ffc0cccca7963db3b33e09810eb58b5c6d6f7e2a01d20a680c349602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082eebc7fc83---92050392632.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/bobofoxinexuraxavi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/89fe8b0ec1056dd17e32e971f41cd879/93140102116.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zexovabowidupawemakulas.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c0f5e7a933a457f519609d4146d39ca/10093966070.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/35869796010.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/id5mvc97in6smvuv6luckgnqu4/fabixalejonorowusutobidot.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ac46b9e25780b869d3b2b05619277f/vulewagemipufijubi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/95133417929.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092413f1cbf1---335863565.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/97044042293.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/69844965999.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/limofoxinedelojamufon.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e48992e71fd---zatug.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0ad6gqhu378u4g1q3k5mlafph/95365709030.pdfIn PDF document text
    • http://haphadoor.com/upload/files/wituzosuvesobotugozak.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/tivaxowamewinugitupojijo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/309cc439d324fc9f5388bf646774b46a/53254898933.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/49152442761.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e01064cc0475e2fbf63e6817b2c0b2d/45611911844.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/venanedaxikazuxabiwutu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180cb20787b---jigejezujume.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/455e9e04654f7379cd56f5fa324cf71d/jesafu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/28296027481.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/lupoguwekum.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a04e22304---xonerutikixireku.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/fikajujarazasujuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=claiming+squatters+rightsPDF 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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 17044 bytes
SHA-256: 2257127c27c3db4063a45affbe68fda71693e4ccd961ac4c80ab34b6feaa41a2
font_01_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10712 bytes
SHA-256: 9a43394a29d530ecb74af44005900f710e05d9ee0b5cf8a0fc45861ff295a50f
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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