Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36341350ad97572…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 01:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b79d7ce2b242ce34697c4d7bdff02ec SHA-1: 94a7aa97d69f2e63a61023aa40c4cf07e087a1c7 SHA-256: d36341350ad975721b33d0591ada35d6c74adb788d50ef5d2a02e05320559e02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://educasters.co/ckfinder/userfiles/files/13875899064.pdf In PDF document text
    • http://shipsupply.ru/userfiles/files/niwowebegez.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/33329283015.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/sibebavapirebu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e357301f0---34975108372.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sodefiteze.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/35459732082.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/10769748490.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mobadude.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/gejuvatepazise.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kh6ur3ul3ht0qmbivi080651gv/kogomojezofoginoparemev.pdfIn PDF document text
    • http://glassick.com/userfiles/file/ruvefodupunupufaxomup.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/14453555659.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/pefejijusiladix.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/20125709225.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/vokelafozupoxe.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/13318831118.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c213268bdff767ed0a746d96bcf1b8/83694787131.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/33883290169.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pk9ni84vceblfqem7jr3egrufo/49993417746.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/22054145290.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/nugukatalovopu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a06a1e9d4---1140625538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=loc+kargil+watch+onlinePDF 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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 10476 bytes
SHA-256: 5ec1e736042375665ee61dcf9d4580c6215244f9be7b59b171d3a411123d12da
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 18348 bytes
SHA-256: 44d75d08a5915b195f811be27e66f85eabfbf47fe26a33db373be006426d6c49
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1