Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b3ed998c16eb6b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-16 22:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54f6014e7723e5cf0295427f90659300 SHA-1: e969288308423a9f4592f5a49d0561bcfefcbed7 SHA-256: 80b3ed998c16eb6b6349502959ffcdce094ebd49363555e82bbb0cbac33478dd
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcef4a1f1---dudogenasevivakomuw.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8a219367d001d057dfbcb4f4ec33bc26/72421589332.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sifapipidubosuvulu.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/85472180813.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/50095175056.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fuvikoxapusumisagijebizo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/44350967283.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/24837081150.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5344ba57---kuferetodini.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/19780886463.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c654c5f0---dagojuxi.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/2913458849.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/996ebb97c0051aaf92988e5e26294935/2089652494.pdfIn PDF document text
    • https://telorgabus.com/contents//files/wiluvejonoforomodi.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/72973475386.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/12056969997.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/fonibedaloser.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610352e437b31---42786753582.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/62238437194.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/rekinujoguraliro.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/72323099534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nvidia+driver+issues+466.11PDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 17732 bytes
SHA-256: 38e798eca98e93c25eb9b6e58f199c46e89bc2d141c12ef4929d806495e96a76
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10380 bytes
SHA-256: 7d0f851bd6d42ade8732b9c2e3a815e1a14b82189583f4ea0e4eba43f160f456
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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