Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac165d5e85032285…

MALICIOUS

PDF

83.2 KB Created: 2021-07-05 07:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 631ccb72ccb4bb407483db7235f2000f SHA-1: 6bc46db2c22450ac5b571db11d203887964845a7 SHA-256: ac165d5e850322851a7a1d9d3cf0fed6ea6d5c8f6b0c5a3e9cbb0378c70c6367
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3396

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=state+geological+survey PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b681cb913a---12619433026.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/bugofadiluwuzoj.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/77195360823.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07d8713df---36926602645.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe2cedd53f---rezubegajepek.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/r4jldgunvihd403ggvgqd0l44a/ginogo.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/vuweguretiduwaza.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0546a6912---noboj.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/walejale.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4tue16q2e2h9g6t7sopmdr4ncl/38665312913.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/kefazagixinuboze.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e45c2935---seloruperoz.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-5/20210605120207414120.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ad2214f54ef267be2cc77920b2050982/buvomopizukepis.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/janatisenegopox.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/pewawiwupidelumiwibipu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mo9rhp4tduu2ikpj979phc5frv/rewudezaxutigogomi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5142dbfae2---lurapiwusupezuxax.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/4865350660.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9tmgchfhkf2vdggcnk3l11kfgh/98092345347.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5abdc492---bepivijiwaradan.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/26391511591.pdfIn 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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 10656 bytes
SHA-256: c33edd8a98e05a2358ebe430f526182087557dcd499c5b144aa96530d7893e4a
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 18680 bytes
SHA-256: dc9f8e1ceaf57c3fb4f8cbeb541531af030704aefc809a874330a3e11de2661a
font_02_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1