Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa3eea09f2c69d2…

MALICIOUS

PDF

77.8 KB Created: 2021-07-07 03:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 806bdadab66403ad7abc226c13b70b45 SHA-1: 2b1a61ede7bff5b55b2f80459f36699142c42e29 SHA-256: 3fa3eea09f2c69d277fcbb9d7157f80c89fe465522c448ed386b388123ae51d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=the+jewelers+bench PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/vutezupeluzotefekas.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c26905cddc97257d50c6aef389a3f371/757625216.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kigowalapimupepikevexa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5137f77a---raxar.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/17670084584.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/wawevezilasetanokura.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160927c3160ede---puragesopemewasuvin.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/59737818983.pdfIn PDF document text
    • https://yuktogel.com/contents//files/gosonumijibok.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/xisame.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846af146433---fezufujevexaguse.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f43f698d0---jojum.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/zubelovugugi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/90487165037.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/luwojezasa.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/50707916342.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d66f52db2---baribuwexevusarelagorafiz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7f9ceea69934e742dabf9d75d07542f8/tojogi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/57903436033.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074813e55026---gewobirinunevexe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160954d1860cdb---saxulubus.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_169E2D36C88FFD76.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/pikajafina.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/93451892105.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 16396 bytes
SHA-256: 8ae69928092d11cc1991691d42894ecbf6541bf830b7738eefa90e2e5cedfbfd
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 10172 bytes
SHA-256: ff978e9f0f8169e1c5f962e54b887a96d9b9bdfe08bea2428f424e451d2e7df8

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