Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba19fbec0141c12…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 21:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3506c13519046f90a23d12982706524 SHA-1: 9042daffe8f1809d39ec78fa1d661cd3afa548aa SHA-256: fba19fbec0141c1240763c0f49115f1471412cb8d997f18bb51b3be0b166f404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=maquina+de+coser+brother+bm3700+manual PDF link annotation
    • https://corianderedmonton.com/ckfinder/userfiles/files/dawabefolepojuvufi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/desugoxevetuduzonagofoje.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ec973a44---74949748816.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/bowilud.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/52455648862.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/89789373077.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/216c227d33ec997c02844aed60bcafef/11445686750.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lidove.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/sobatetoparuwajutagel.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/66382129297.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045cbc31539---63838250599.pdfIn PDF document text
    • https://efnnma.org/files/file/vukuvoxeda.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59421678a7---fetuwunujujomu.pdfIn PDF document text
    • http://espicycooking.com/files/file///sebarabupofi.pdfIn PDF document text
    • https://lemanssrl.it/file/95319708442.pdfIn PDF document text
    • https://fallsplat.se/file/85891785322.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/kazivomif.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/34759746629.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/74063831502.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc745ddb33---wexene.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zuruzetunavazered.pdfIn PDF document text
    • https://breedlife.com/upload/files/sudipala.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_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 18580 bytes
SHA-256: 544368a6271c8e1e3f9911f889f3c119abca36c10fd0c922126e7963bb0d836e
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 11360 bytes
SHA-256: 77b27503766e04a8636069b8d4f535127737957202f15fb961f61f139214d86a
font_02_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1