Malicious PDF — malware analysis report

Static analysis result for SHA-256 d185dd746af1bf8f…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 06:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 834ff93b8e3f17da8049e232c0068b95 SHA-1: 06828eb0847bd68dd660a4bc5ad95da37282af7b SHA-256: d185dd746af1bf8fa349a97dceeb8a6617f0650768bc7bf5469dc518a0b77cab
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the embedded URLs indicate a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://medvor.ru/uplcv?utm_term=against+the+grain+meaning
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160754d382d5cb---16788488326.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98874c703---numaluxov.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/12031791425.pdf
    • https://mollis.rs//files/14548768054.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9d2c423574f7e594a086840c1004759/kimaguwokuvevilu.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b27bbef5a---dalipidefodukovipetof.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/651a415e290e6b63ce819cefb9086ede/17523772370.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ebabdff97317412bd5d4700b239a634c/89777614323.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a122671d07ebcebedfed5e08fbd0f157/falezolida.pdf
    • http://incucinaconalberta.com/userfiles/files/vosuwurax.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2462d96412---81125974379.pdf
    • http://ithaca1961.com/clients/875375/File/gamugudadobobitakolisa.pdf
    • http://natproperty.com/userfiles/files/66483612320.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4647a989c5400a4a4de552d3aeb2a24b/rukab.pdf
    • http://artside.org/data/temp/file/90997270437.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d9bc1531---dorijegarav.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/5t971l1kpcqrmd3d7id01mq6p1/41920974336.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097883d05ab6---xomixiz.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bjtums6u2oco62q4jvf9bapb6i/45252119180.pdf
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/96675739395.pdf
    • http://mabifitness.it/userfiles/files/zoxozujogijuni.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d46f28cf---21310286084.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010d63.bin
5281b5b722a6064b8e4898c494344e1331b6ebade5426bb3840af6a31f0efa6f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D63 17616 bytes
font_00_sfnt_off0000de0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16792 bytes
font_01_sfnt_off0000f625.bin
5e25a990f610a1834b5a6feaf19a4983917eb0b74e2385655944025e8d9d904f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10368 bytes
font_03_sfnt_off00012863.bin
acce38674855406d263ca71c642b4ced8f3d9dfc9ab434c6c8ed388de27d55b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 18372 bytes