Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1861374cd7af20f…

MALICIOUS

PDF

100.0 KB Created: 2021-07-07 00:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abab570c283ad992e4c6d81df7ece891 SHA-1: 4a2a21d8363a557c0f9a80570da3a30d7751bead SHA-256: a1861374cd7af20facbe5a1f5c4ad9f935c62fc2604f3e1c251ebc36ec4c5343
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. Several heuristics identified the PDF as a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those pointing to WordPress upload directories, are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/16dvmq7si63hulccm8v97oakfe/9948919544.pdf In PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/34231247364.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f065949d8---numazosisis.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc73ecfe5---mozekezurenezonafomujife.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4145b4df---8667078651.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/viwojasozefop.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ccaa72ecc738f87298a3ab718a26a035/72401733894.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/48881683112.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089f00d216ed---7345489561.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06c6777f4---defalugoxupigewirabig.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d8ecf074---kojumaborime.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/tisofexewitusonul.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/mli59ef2fdfmbtpt8had3h17ev/44636901013.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eca25487e2f6cb38bfb7857e9aaac973/tomoxavarawu.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/79514438709.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160847e49ba8be---temazubobidaxe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4cae32d9---rusujazenag.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1e6fdc2d35d93cb80f96137e396bb9ab/87101965459.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/loludefejimi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/5372262065.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b4ca1bdd---48012346338.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/gikojavumuwalofuvawuj.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/af1b04e6f3905269279352c50840a197/83570932902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=questions+on+ramayana+and+mahabharata+with+answersPDF 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_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 10968 bytes
SHA-256: af9026b03b93f06b83e0bfce561f669888fea9f2148ab7f9a9e85d25f4a991d3
font_01_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 17384 bytes
SHA-256: e3a77ca01cb716c6a8a66dc6a71d246397097fe156f5755e4519d1eac7bdf55d
font_02_sfnt_off00016a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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