Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d2b28130bc4443…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3dc199b163d1f888e00c619c0f5ee9c6 SHA-1: 3ab402e28505ae9a3d48470f972c0380b2c163b3 SHA-256: e4d2b28130bc4443db5417680772868ef325062261de0c859774fc24f55d8e6a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or redirection scheme. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60f087d3f69644f8f8428cec7ec65374/60273587256.pdf In PDF document text
    • http://phanmemerp.vn/attachment/files/25787554593.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///63261785234.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fedd30b4---76960491909.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01af10ec4---46172235963.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/votegibanawoninusi.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/rezilubijefod.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/56879290392.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/49286519127.pdfIn PDF document text
    • http://360global.ca/userfiles/file/17090607191.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/misomovuxibetivujotiba.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/zavuxewodowoxovidaf.pdfIn PDF document text
    • http://strahyi.ru/images/file/suboxexukot.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca628e174---95397613030.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/76335885891.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58357913f---wepupuxazaguwotag.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/975d71332ff7e922f14e243809a9b277/48843846775.pdfIn PDF document text
    • https://finliz.lt/i/File/75770550978.pdfIn PDF document text
    • http://web5gstore.com/Files/files/61721276199.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1f738006d3d0409ad2c658373ca60b39/mavotuko.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/3790947368.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/nexotokufewi.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/79369593600.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/rovibeb.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149fc1f54bbe---zuvujuwame.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149ee3721a6d---vugafiwirigixibomabaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ggu+amino+acidPDF 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 15588 bytes
SHA-256: a68746e9fac2abfb47f616d4c9db6e2c709c2eb0c02c0cda548e7b385cb6f953
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10308 bytes
SHA-256: a9eabe0ca23dcf39f37482ecb312d3ed1d3d754d62dd4f382e52e552680d108f
font_02_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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