Malicious PDF — malware analysis report

Static analysis result for SHA-256 df14dab169f39fae…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 10:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 274df7a6177c06e6cca2138db06d7890 SHA-1: 46b9660cdd973a9923111cc77e6573a195411331 SHA-256: df14dab169f39faecf5c7e16a74368f31ca0c0408cdf99a4fc3f7967e5962a29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://aucoindeshalles.fr/menu/file/wolazewukepewu.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/30749437412.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/14536294754.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/lovukafiz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b556fba9---tugezupiligosifekixefopa.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/neralobujovamejiwexun.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/73352544902.pdfIn PDF document text
    • http://apcmagon.com/userfiles/20904009823.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/54228511749.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/basiriwifimunomesajesu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdeae5e13fd---86271601640.pdfIn PDF document text
    • https://gangnampools.com/contents//files/gebevu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/nusox.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/vizaredazewedaderoref.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d54a1ed1---xogim.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/88699779736.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bb8e01944117f3946aa17124ec6d27d6/zanudipezoviwegerusu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160830dc817592---70493526169.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d81c4bd79---87599729791.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/67559882453.pdfIn PDF document text
    • https://hgb.se/filer/file/90544742794.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c725512e35---78472151302.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8868eace33---xebasiwofosa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/75da607eb1b83da058f101b169d89913/45336584303.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bc2fe03db03638652551a53baae17f96/nibusulepimujekotu.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/7071109417.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/ragegupulumamoguri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=metformina+y+vitamina+b12+pdfPDF 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_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 10928 bytes
SHA-256: 6fb893eaa9f0440e6807472e90341e3c40d679247b192c60c9ebfe8c7e26c517
font_02_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 16652 bytes
SHA-256: c175b90a77b53fd87ffaac1e74620ddf48401562823215300e04977c27705b6a