Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfae8e663363a0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 16:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1c86824514a0ebe675f79a45885ea5d SHA-1: bbd60029d6b025039c8aa766db3c58b2b05be35d SHA-256: 82cfae8e663363a0490a71f9f7c9493baa401c005ea9c890f27c5f0c4b4c0db7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics suggest potential exploitation or redirection to malicious JavaScript or further PDF payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://interwork.sk/userfiles/file/weteguriteda.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/latupijekaref.pdfIn PDF document text
    • https://mkontakt.com/dat/file/xojupevadaxolabagomuj.pdfIn PDF document text
    • http://houselandia.ru/files/tedofituxaza.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323791be0d3---lesiwusenefax.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.pdfIn PDF document text
    • http://freewest.at/genelir.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bupev.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/kurefanopobapujolegif.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/12001795863.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139795f54614---63649785983.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/guwiwakutewadugaferos.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/78224560161.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/5173503855.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/63443691064.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wadizebeja.pdfIn PDF document text
    • https://dafelia.com/files/tiputunuvafunugewovuke.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f6aa3710---78732649390.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/87727887765.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/80564380485.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/tofedazetopidufokofor.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613598eeca33e---59339949457.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/49046462340.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/35790948329.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/litimigobavido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iphone+11+pro+max+price+in+bd+2020PDF 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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 15928 bytes
SHA-256: 1a8bcb799da45fbecb3acf2d75487884ca816a9b636ab50737c3fd3498d581bf
font_01_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 10952 bytes
SHA-256: 007aff29bd4b6fa29d4debc22fa75a4fdfc641c940a3f367f35564eb70239484
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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