Malicious PDF — malware analysis report

Static analysis result for SHA-256 37806834f153726d…

MALICIOUS

PDF

91.6 KB Created: 2021-06-26 04:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b6d195ad8a05ab06a8f1ed703749df19 SHA-1: 492600bee3e1f98569d4488042a3c7428c97ea15 SHA-256: 37806834f153726d26d5c5e2f0b06d668edfd7efec35dfcfefad4d6c9a552b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=dumb+things+to+say+to+your+girlfriend PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/epfti57j5jc9qv52251o22mrc3/minogexe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3fb4cd37af4254d7f2a6acf75e78e389/xibunezefezapiravilig.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7demh5jasibm1q7grg369nr172/92703554864.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qfjj0s9c6ocsthkj1gnr1sru7c/44587123390.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/acd79db5a879724c14e66a018fde3c0d/91916324080.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072034a69648---39286042810.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jokumitodatulatafuxi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4320810ca4b8da663c59a0c4c045da1c/javifafagerisumovusurasef.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qd0dk5qr63n3j68qtcauvf95hk/luvumaxadavif.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d3d11c04---nazupo.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/kalefunufuv.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffef814507---46713660967.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc86975ea6---pebijezowunuk.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/xufasufapiwusa.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/78bf22fa6a522d37a4e88bd28d399753/18086750038.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953ec2a3aa2---12731690728.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/26483509072.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa55b9d732---63901836944.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jskq1dmc3t0414h4kro1235187/dotiponi.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca3d96b82---59446433096.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d4him48urqn2avgme1ci3gh9oi/dokofuzenigokojozuvezino.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/4051965981.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160891a18e1dee---291933654.pdfIn PDF document text
    • 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16676 bytes
SHA-256: 2a8daaf738ed58ad1d1384dc09659ed7d6c5c9482cf4d1cf1e15cd50f82811d1
font_01_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 11156 bytes
SHA-256: a81f5379b94b13d453af18410efeb70256325b16aae68a7fbce8ce6ee6571b59
font_02_sfnt_off00014903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1