Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a821eafaf45d9e…

MALICIOUS

PDF

71.2 KB Created: 2021-07-04 01:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73c66c2dc8038f70a4e4636b3d796397 SHA-1: a3184183c7440b8982c216a87b252b24d3b42808 SHA-256: a2a821eafaf45d9e08414cc8e229e6c6d21ce2748f3ee034a43314a1905051cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://crewmak.ru/uplcv?utm_term=how+to+add+pages+to+a+pdf+online
    • https://pet-fashion.ro/mm/file/podivewufabu.pdf
    • http://ruoumoc.com/upload/files/74889579133.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/678a9f284425ab9d127614f336d27220/titubesurofujijexi.pdf
    • http://euro520.net/userfiles/file/1621783465555287149.pdf
    • https://perfecthospital.org/FCKeditor/file/viniwu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086812a428ba---gojoxasojixu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1008a1b00d0de63c2992563a2e7f9920/mesebediv.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd59f51dd9---pagejope.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4e01cb7d---rinitifovizi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bdcb8f3d6---nojugofuvef.pdf
    • https://greenfuturevietnam.com/Upload/files/96609897807.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/be28975b533f131d3bf99b847a7de968/71164919822.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/475nkeps3jb7gtlb2q5r7sglqh/mapevetujew.pdf
    • https://mfdesign.hu/files/file/kowabuxoker.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/dipiwusajawofu.pdf
    • http://arniestribu.com/campannas/file/puzakura.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4100c245b970e04a928f5da5e142c3d7/69857232873.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d921f8c40818efa59a2c0a2871347004/tojesumaviwureta.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7anjoss1fgpqn3p31e9cjasqq2/zuluzirikuzu.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996040d8700---87562701248.pdf
    • http://akcjonariusz.com/UserFiles/file/34109259660.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a29de769---tidukerafewitokereb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 16792 bytes
font_01_sfnt_off0000cfc1.bin
576394fb50fd3f2f7e0f15c8f268d4208802c230a8d9b30140b14785749bf0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 15592 bytes
font_02_sfnt_off0000f77d.bin
71955445d07a9b22bee1a896f5a0b6b43c1a74eb1744b818adcefafa00d68ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10652 bytes