Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b0db75c7bd1ea3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-16 02:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cf8b0d1e6a56e47b62d117228c24dea SHA-1: 12a0f89c94f7735df15764b7ee6d98dfe4db3dc0 SHA-256: 65b0db75c7bd1ea3d02d4ad75d9bb9fca1e9fe82da0a98b68d33e39547bd759e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/93300a2d72334869085b1ae7df49efd1/rugezuv.pdf
    • http://grawerlik.pl/userfiles/file/34749072323.pdf
    • http://fotostudiovaccari.it/userfiles/files/63008496014.pdf
    • http://nm-union.ru/ckfinder/userfiles/files/14149735640.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a16517af472---soguvorizigunuboviladeja.pdf
    • http://ride.hu/images/uploads/files/konurabif.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c6261a94---lagagixizoxubanarevuseva.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1808f53d---28039834145.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7296bc325e---xisuwepesowutabixu.pdf
    • http://phdpecs.hu/userfiles/files/kojiteje.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/aj73qrcltqgcn4lo4eaah5qg9r/19196042672.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4fd01f5d4e52824f0f5b1d25e75c1b9d/73058679496.pdf
    • http://i-daa-wl.de/userfiles/juxotezomir.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rejunula.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/60402804622.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/52b56f787c418192d7dd515a6a0feb47/nabikifod.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86585941ba---56781994697.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b587a5e1ab3743ddc8183cfaa738cb8b/kurasedomijesodewal.pdf
    • http://nappsa.org/userfiles/file/netebum.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4586bf031d38db3ee72890ce959bc49a/gekazalopepefebib.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xuladuwelerorimivo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee939c443d---dobumawojom.pdf
    • http://sola-brothers.com/userfiles/file/davagumarefuferagixoret.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+happiness+of+pursuit+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_off0000ff8c.bin
4d4aecce299a50a783887c88cc174d920728ce7a7688352381604a305bbb2c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 18312 bytes
font_01_sfnt_off00012f6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 16792 bytes
font_02_sfnt_off00014786.bin
866eb2e6a1baa0e7c300c884765b2414a4341ec8951f9092c2ef560de4b53b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x14786 10612 bytes