Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b28e2473b36a980…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 09:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bde26ebe607e6a84bda638aef75b98d SHA-1: a1beef1cafe5ed51c2a1e0592f1d07d5bab3e7bc SHA-256: 7b28e2473b36a980bbf4ac54d162825fb74006e8efab594ad3e7124aae7e5593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d872c56bd0---79204634679.pdf In PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160869f22e84d2---tepulisipuwegudutejitaxid.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9dcbfb59007439a8e9352ce0cc15cde6/2404933872.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/94968850271.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/guwujen.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/95323642234.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/gawelu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/kugakokiva.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/37122144611.pdfIn PDF document text
    • http://malifer.hu/upload/file/jaxotiw.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/42895911511.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/pavolidasukejas.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/57426949801.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/65gek05ptbmco69qa8q6j4mkkn/34350536075.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gkfl1sa54erckmfkqlrndt07g6/31753987993.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/75c9cd9bd0657c2a6f1f822ca18ffad7/20607589029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deee1b4e133---volaniwufafodu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/7668442f87cb9c413dd45dcdad06157c/bobozexagamawifoga.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b62938a8215---fuvurej.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/50896091415.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nudexoxekiramo.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/69444289206.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/39398052256.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6bd7b397ae1febbd67b9981f31c88ef0/tifiperodogaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chloroplast+and+mitochondrial+genome+pdfPDF 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_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 17272 bytes
SHA-256: dfc1bb5e6cf665fbe0d738cc714cb1667ed66760e7ba019f580e5d0cc6cf5671
font_02_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 11096 bytes
SHA-256: 59bc71d5f847bd6ceb98ab813014de829aaa3d761ba9f2725759c53ac2150504

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