Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c759e2194ea506a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 05:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e50540952bd5f7032242a7cd5f6b0658 SHA-1: 84dd0e3e915adcdc91b9d8dea0eaa1d04822ea97 SHA-256: 8c759e2194ea506afae488e58c9890ac03e84947667cefa082137be7f06cb1ff
156 Risk Score

Malware Insights

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

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 CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hpworld.hu/data/pic/Image/file/1816091849.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088671f6b06b---56912719605.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/sdplu2pju6b2mdp8i5djt8peg7/nusatapudu.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b51d2a47830bc6f7f14f4cbea9230425/gusore.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c78c54e1864---semofadug.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/06/33880788767.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/78953057964.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f66a66683---vefekapapabatum.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c5d3499003a0aa9cb0fb097201d5dbdd/xekadudapepisi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87937956246.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/36186946550.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vesimiziwelepurarexo.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1bhuamibvmfk9i72qfe79g7rj5/xatigegizima.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/53132397884.pdfIn PDF document text
    • http://hk-keber.de/images/file/xexogagazawanute.pdfIn PDF document text
    • http://kaies.net/upfiles/file/vifivopuforewafinemosido.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bamifokujotewerafunuxidi.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fagosutopiwevojelibom.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112dbf5f0aff---xifofifovumik.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0f4cc56---bolokod.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/42296682278.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d0785eae4db8a52e211e214517933a91/70066131338.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/puralolopi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960fa875385---15430419989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=milliamps+to+microampsPDF 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_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10292 bytes
SHA-256: 5045aeda036d36d6c36c4f5c347427a6f53e75f45f1b36f77c5d3f1f368d9268
font_02_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 17720 bytes
SHA-256: 3ca3ec011529da6f6b74cf50504bd90386bd718a85621d2c328ac61f7d549577

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