Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd6505f152fe5a…

MALICIOUS

PDF

101.7 KB Created: 2021-08-08 04:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263d9a8f6f401a19634017fb1f11bf06 SHA-1: 0f1b8715614fa405ab1d3465b93964851a8a9d91 SHA-256: afcd6505f152fe5a2524cee353bd90e65ad64e60f7e213f21cf30a1df492e7dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing or trojan threat. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://narcisse.sk/editor_uploads/files/zonararerazowa.pdf In PDF document text
    • http://ziva-muzika.cz/files/file/19972338887.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c379041901d---nukexiwevepazijuweni.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fudodugaroduluka.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/34254635346.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/75tvp43re49mk9hn5d7multtm5/dexazuwizunakaxanu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874cd0dc06---39115337944.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/62002933699.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b12dc41522fd4499b058c772277793f/31588341281.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wolarowiviw.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexezamozewif.pdfIn PDF document text
    • https://irrisyst.eu/files/file/31372009360.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2b79398de975b6fe8367ef1698245ac/12239817494.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29971d5f5a---patije.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/tefofekudozikupebi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb069c9052---tewopudupo.pdfIn PDF document text
    • https://codecs.ro/images/file/46004666825.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/82764013921.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/68679513592.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/70718936856.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/47286530298.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k36q67tb53rjjq26h1662oi9v2/26409078897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=divinity+original+sin+character+creation+guidePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093017120d9e---fodosupazexuvewaxopalaga.pdfIn PDF document text
    • 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_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 17188 bytes
SHA-256: f953b2876de61494d4a5e102e779e5f2822f50666f824e18944b983e7c0c7609
font_01_sfnt_off000156bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED2 10928 bytes
SHA-256: 7428673df57132c490ef903e0a1ec2d9b15cdb30537a72a9805011f694e2573f

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