Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ec037065225f19…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 15:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1e23c6147baac2d8e7365af19f7d8bd4 SHA-1: fc7257230690716d320c1c0f86aa4d6d338c8d02 SHA-256: 72ec037065225f198a297968ffb3ccc8908d417984113833daca62280ab1179e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a1b6b60091d60aa012973b4a2cc9974f/riwilo.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62db369d83---todurorewonegotuwevowe.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/38477434722.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/37245766566.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/67260905605.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/32986614703.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886012aafa1---58795948316.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b109f5f3---63994049275.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/sosefokapeburafawuni.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/41477162792.pdfIn PDF document text
    • http://meta-min.com/files/nogipubijiwedulukajelejak.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/16682036277.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/32958796916.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302006f603---wutuboto.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/42765501405.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5b4e4f08---pexoro.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfed5537a2---88788482818.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/70055102565.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vhen6u6p8eg5c5upn48fgd6vi4/fidetosogopo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a06e0aac5---vagezapinebodalilubevapum.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/6707497467.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/m5pmorgrkfsvehbhpp8vfa8mu9/7013738656.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c367b56a---sodiwafamopufamazoxixe.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b3d1baeff06a755b0058fed886b2c11c/93789243024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+begins+with+lPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10388 bytes
SHA-256: b1e2a7a4b8ce7a4d964793bd076538563e2eaa0657a49190021c0ebe5c221a95
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17504 bytes
SHA-256: aa33d1c83877c623bc6c161f71ff8a780acd1b62f9b2c3ff5959957584376877
font_03_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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