Malicious PDF — malware analysis report

Static analysis result for SHA-256 91076b961b189a36…

MALICIOUS

PDF

95.8 KB Created: 2021-09-20 21:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35646242873bb4159746cc9ccff0c1f2 SHA-1: d92f5626729af1ce2a7e8d74eb97436eab742ae3 SHA-256: 91076b961b189a362589b1c8e58ebd38acc12fb4c5005ec59459bd4bdd5b5841
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://videotour24.com/data/fckupload/file/vixujovezugulet.pdf In PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/75248602535.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ru7uki4uf3dd4is8b2041uvf7o/fajag.pdfIn PDF document text
    • http://gibisch.info/files/files/nutomiwibofisuwizojudaga.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/79797113045.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/78690556968.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/rugomivodotoxawuviti.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/68544885386.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/62656099507.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/83384411346.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gm8cq8oj46iih2krbbsup688lh/sodopelikawodimojo.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/72325847193.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/kutut.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/43948152200.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xodutogoripub.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/74003391287.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/wovedawamadafenemobusul.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9bf76830---87407537434.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613348f5cf605---7487034101.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/21735662037.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/7566648149.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f653d7d18a---valanoja.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kitesefixujap.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/58328575841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=salvare+i+messaggi+di+whatsapp+sul+pcPDF 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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 19364 bytes
SHA-256: ab76bc026c21c294d2adb81c4fe4617d070c5899509a0034f1b606ade5a9531b
font_01_sfnt_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001577c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577C 11064 bytes
SHA-256: ccc6c688df84e4e66158910747266d7c6f600796a752f22136ca7f8dfc10d9d3

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