Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab66d5eb647c46d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 23:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2af17e1c1ca615b6177dd4be3a581e9 SHA-1: 4f63a279549f88864796660c49fa7c38f673f830 SHA-256: 2ab66d5eb647c46d343cc2782e04a6eca68920ae74c77483868d33d25058b21c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=benchmark+battery+android PDF link annotation
    • http://ueros.fr/admin/ckfinder/userfiles/files/79116763832.pdfIn PDF document text
    • http://splogservice.ru/content/files/tiwuxos.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b13d4a1f9c90848fe0323599af213ce5/volidofomesomedatu.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/44370893128.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/63905276488.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sumuguwurabodumej.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/nufomifabumufigo.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/74882937863.pdfIn PDF document text
    • http://teresachild.com/upload/files/66484962861.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/3383570573.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/81281523659.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43448275374.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3r27cqcn32bb9a5eor9sf533n0/fugis.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/92061567320.pdfIn PDF document text
    • http://kco.su/userfiles/file/14914779154.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/fudakumanunalezap.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbecc38560---87833842629.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/87673547847.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/77428184419.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/76686309143.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5080852e---25771922709.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/54025474935.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10820 bytes
SHA-256: e156a9cc04c0d0fdbe5573e6338edc70a3cef4b349638e2cd84128aaa2daef0a
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 18116 bytes
SHA-256: 95d7613528d37cfb784b744dff4eb5e51432f3b60af25af4f13152d4e65f4f14
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1