Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f1c9368d488ea3…

MALICIOUS

PDF

104.0 KB Created: 2021-06-30 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6b91037c65bfaec672856a977db7da9 SHA-1: cb121274509cae3d934a0763c5f365a121786eed SHA-256: 29f1c9368d488ea3d0ff890df2b5ee9fc6192abd1794abf438cd134dac1f9782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5106bd10f302d9681e7205cb12e495f/pozuvojiwenewaderi.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/64c270bcd8267f1c4df4e398635b5472/jekapisiwubejolonesex.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984cdd8cdfc---69172301025.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/difugawutu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdac4e4b8---33359315409.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/kolazi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/mq67l7msc90a0l6n9pokl1odgv/55219029499.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/17a5dc16961559e88f2c823edb870050/92310929416.pdf
    • http://ebiocell.com/uploadfile/file///2021062709085150.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b26260d86e1---17292092762.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pnt559lpklj15dhv2pjeepg9t3/xisinibuxivopubofobozab.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6sp0vhhussu5fsga36ce3n9a13/3257887695.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0dd463f118e0c51c852b2df33431c561/14727962367.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/1642416211.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/urasas7m5ntlu213k7fa5vb2ru/zofepigevose.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06725ea87---zetusotitajusafitup.pdf
    • https://mosconi.net/userfiles/file/87096295057.pdf
    • https://btegypt.comfile/pumunelasidexilufatirozu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c41d932cb---32516809813.pdf
    • https://my-natural-style.net/upload/files/93647293280.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gatotepapatetugomasamave.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7d73be86d274bf9786ce2b68beb28174/tutepotubeboforatatelapat.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5ps8mrd1ikf84ufaoffoqbmk8d/meraxiwuremedu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a929ee52da9---xulibovisove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=all+states+have+abolished+common+law+crimes
    • 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_off0001351d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 16792 bytes
font_01_sfnt_off00014d2f.bin
a70290ba36691dfc5017abcc8c0b9b1790c5ab5df368463ab7e2f890d4d57a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 17104 bytes
font_02_sfnt_off00017921.bin
ad94d08b9faf0bf2b121225f8ab70e25ea5c21f53209bcc4abfb14e4b8872bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x17921 10908 bytes