Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad55a21c9669460…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a12134cb2c751870e931d64b861072b SHA-1: 58843a72df0ddfb10070b110a26a261cbd83e4ad SHA-256: 8ad55a21c9669460f17bac54a98d4cc859095a08a237c7131e6caeb1ada94121
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, including one pointing to a raw IP address, and heuristics suggest it's a link farm on disposable hosting, likely intended to redirect users to malicious sites. The PDF structure and embedded content suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://youxsoft.com/uploads/files/pebeboxuregavejawebok.pdf In PDF document text
    • http://immobiliareborghi.com/userfiles/files/mobulix.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/79486841511.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/pebaf.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/duzukigo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613339d722a0d---89357911454.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/desitivog.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sotajajo.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/jegibopopazunu.pdfIn PDF document text
    • http://slotkuda.com/contents/files/39600169937.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/40124561006.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c910206b74---18377348859.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/37555855132.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210915_B108DB3F05BB26B2.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/titemegol.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/riwidobaxoderi.pdfIn PDF document text
    • http://baove247.org/upload/files/6058602394.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/73780247225.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/ronadugos.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151235cb2318---32319955.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_102736.pdfPDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/998fb467276b67c85e87a42eb4ac2107/15706822540.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/marefaganikapazu.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/93884467988.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zuxosowuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+best+build+for+kodiPDF 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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16200 bytes
SHA-256: 1c340361699693ccd895ff43db61c8228fc0aab130a9dcdfc013025f7498a656
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10480 bytes
SHA-256: 17d9639223c22cf182d6d51e9dce60af95ea6baecb114cc3b01257a9dfb33f92
font_02_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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