Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2765cb991d7f8b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-29 20:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85ecbcd260bdbbcf3e676b57b4dce65f SHA-1: a787f73e2fcbb4cc31bc6ba936767355e0c5da05 SHA-256: 1b2765cb991d7f8b83887242929e405ea59ff93c11644616ce686138633c7cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. Several URLs point to compromised WordPress installations, suggesting a tactic to host malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=social+club+fix+max+payne+3 PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f70df019a0b6c6622532362efce9bb80/85260427534.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add8d8b6e6c---vunofoliberukenuvif.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/2016035525.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029ec46d7eb---sugogojawiv.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/sakusenetegejuweronirujan.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f4616f6b---69101752522.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/11575224631.pdfIn PDF document text
    • http://debden.org/userfiles/file/98723754813.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/xaguxokexefepunidonorox.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/wiwimorajosezuwo.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kfjlkmimvabpk7ebfs6fco291/48733439326.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a2473db5995754fe7d725fca8be4caa5/dixarebikuzexipivobixeki.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608903a6d416d---92332700132.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79409063799.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/arogkk2i1esrrfv1an226du2j9/77944584458.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/73869969522.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161028edb401c2---16636460314.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/989120737.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4cc4c74e25a379133f700b6dd09f8b2e/pitevilapafowew.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/razevaw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/280040ab5eef5ef87459a2960ea64d96/jasapimazujaj.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rjhskjkt2bncdt7lhep49crbci/25371505308.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870a37c4a3---58995247885.pdfIn PDF document text
    • http://hanifeugur.com/image/files/80365309210.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1ib1e2ceqm9d6es8lkl9n2nvni/kalunew.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/71368470939.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
stream_004_off0000ed4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED4C 21440 bytes
SHA-256: a40c4b028ef560124939cd2cb9803c4335a7df3104bb7324727fd3574a76c8a4
font_00_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 10980 bytes
SHA-256: ba5985ccff8ffe5ed33129506ba7a0e67ee4196301c88f1f9f0a9ebe4d19bb14
font_03_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 17544 bytes
SHA-256: 3fa33eb6a3ba86a6624e937771d3ab41665aaba73ed9bf38954a79fbd800ece8

Open this report in the interactive analyzer, or submit your own file for analysis.