Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22fba0a44da9b2f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 23:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afed1bba499dc532b9a0801c39fadacd SHA-1: 9cfa4eaf53b9095b11993dae3692f03626b87d7b SHA-256: c22fba0a44da9b2fd223ad819fe6eefe494cf2b2a91e3fe2b0d747a4b20c5689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d1835ee5---zofemiwix.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/2morh2rj84u4qo1mmsln313f7o/79188560784.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r9j2mq9sfmgg0i2ahegru3n2ad/96530321665.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/43ledqnpan9p0s4o7anhh5hof3/58421083318.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4334f2aa---21832728387.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a12813e3---46206148076.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/82ts73716na9eungc718dalfr1/xaviwajovisinidav.pdf
    • http://poltinik.ru/userfiles/file/biragivufafiroxuponemalu.pdf
    • https://brs.jo/userfiles/files/39911533400.pdf
    • http://ankamet.com/userfiles/file/gofukejegowonusu.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/gamitelixunebexixox.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/78614788833.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/99218130447.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e07c8b6ac---wonevitugi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3032cb516---43399851035.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/p443pbgvvkgu2fvcj0egaqf0tr/keneduja.pdf
    • http://baobianhkhang.com/upload/files/wakanajuweletowedagikokoz.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/59534164160.pdf
    • https://turkihale.com/userfiles/file/botagozivetixim.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/edcjq9s87llc3lr8jfpec844or/95414272547.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=short+cheeky+quotes
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/85aa75a5690cd5ebe3cac387457a7142/zisozarimifos.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_off0000e86f.bin
1356e0193db7f73509b80b6ea77c1ff7753e3d844ad263c8663ff144b286dc51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 17128 bytes
font_01_sfnt_off000114e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
font_02_sfnt_off00012cfc.bin
73a71833dc923c5607ff69e741a2479afaf54e7028fc4834682a675b799d9c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 10452 bytes