Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b423a5fe50c6f9…

MALICIOUS

PDF

94.3 KB Created: 2021-07-07 05:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8b372ef54a816c8e9f154d5547cb1e3 SHA-1: 3e481cf939d14d8a628993652c56dac8fb177328 SHA-256: 66b423a5fe50c6f9cf9a55c94d5e44d91fe7cbf644cd28a1ae3eae87c547850f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress installations and disposable hosting domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS uploads. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://cructi.ru/uplcv?utm_term=what+type+of+insects+do+bearded+dragons+eat PDF link annotation
    • https://energooptima.hu/upload/File/36439925742.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///53742474302.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/dopegitomesoba.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a794516f6---5091405375.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62b3d5694---10197298238.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0829f25d---xemupijuf.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9813b2d54a4106a770b9217cc3749a58/87081689700.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0gqm8n1oa1ft55ee5ljvi176de/nobewuruwuzunawabajukiwo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/vuwuwexuxedurujumutitina.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vesaxenebub.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r9o1dfov03bgp3of580hqhpde0/misadinajizefavamuwiduw.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2e0053a3f09fc8344155c93788652d58/73397692274.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/664c2d94b1d7a5322fcccb7193ee5488/60423883141.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983884c53b1---vofekuwinelaxop.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979ccc9c9aa---zuzoxojajagefu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/04f3f7383c12ee23130480eaa3b86649/70813087868.pdfIn PDF document text
    • http://deauville.ru/files/file/wodudopimelufezun.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/23213842147.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d95182949b990068f5666fec43ae35ee/rodojamisediva.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/61998864079.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/duzujiwiwumomokege.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/537d157ef3d3bda233c02bff42499970/bemiwi.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/vigugumumogota.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a270439e865387769162326fe57a29c7/90692943865.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4365e7806---dusik.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/63508825263.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16912 bytes
SHA-256: d21f80ef797e34f49a5244a81069dfedf7f31a49b0a3c7189d046ffe74c2e0fd
font_02_sfnt_off000139f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 11100 bytes
SHA-256: 81cf356ab6c06884923cf11a5b77e45103034ec2efa98923b620dca21168b2f9
font_03_sfnt_off0001536c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536C 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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