Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3804a4067c4fa37…

MALICIOUS

PDF

93.3 KB Created: 2021-08-07 13:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 74374d3ec2e48a2c94402a240c2aa0a7 SHA-1: 695240b460472b6e97668926be5085d79fba53d1 SHA-256: a3804a4067c4fa375e49241563455646303b5222a98d2b90316eabd79b93d317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure align with common techniques for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://likebarcode.com/image/files/20210727_171026.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de943c2f31---kolumujatoriwuju.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/vugerefi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f87d54b5b3c3c7c75f5fdd7ddf247280/95720584674.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/nixugosopa.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/26558958349.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd47e0e2aa---83853129195.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/75528874203.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fessi7lr0sjs62teeqt3u5v54s/xatumamekedekezomagusirun.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3a535b39cfb9b3fb19f9ceed3cb37773/56520013849.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/depaf.pdfIn PDF document text
    • http://kme-kme.cz/files/file/43986090289.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fce95ece2998ad592cc0a6f03fd21904/83586962175.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0c5038339e019fafb61823d3751eb162/53170136540.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082aaf455850---34657265961.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/93112481703.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8e3758e3417b0ca5fe9ddde7bf4171ec/xijimofifolevi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kakifaxinaweje.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zazenuzokopekisofaraf.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/begopovoduk.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33023737040.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa07aad182---49476815184.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b852c223166---18714179929.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/82921822875.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/midibe.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/govumadavoxokupiliniper.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d7191208e7bac24da004d1e3909f156b/simazawimivuriluditeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=matriz+inversa+4x4+ejercicios+resueltos+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_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 11144 bytes
SHA-256: 6e81f507631c21d2dc41fd2ed264a847fac87fa4c52b2f525b668b0f512bca24
font_01_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13595 18332 bytes
SHA-256: e6e9dd5361a3b065a0bfa10217df7da2391810b8b595868b932ee2deef845802

Open this report in the interactive analyzer, or submit your own file for analysis.