Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8e5f5056f59036…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 23:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79c14d4ee9d9edef7bed00fb89ecd490 SHA-1: f85bf785dd52429c4ff42a7780b36ed11885e7b4 SHA-256: 9f8e5f5056f5903660c62108879d4435e115a0894533c628393b71b2a5bce558
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=mortal+kombat+2021+rated PDF link annotation
    • https://classconnbio.com/img-jacson/files/20465583221.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zudebivesabusoluwu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/mebilunetalenarijesadu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/g8ob570sg76gvd6dtm443qcr7a/35946186253.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/40738138882.pdfIn PDF document text
    • http://davcpundri.com/css/file/luxorijaz.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/jikudi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pasaleriwig.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/pexoxatuwo.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/73823261736.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/dezepixutofudi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/41527304804.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/57864178003.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb2fb4fe0---46179032877.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/90977891471.pdfIn PDF document text
    • https://melz-feu.ru/upload/36913211465.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/lajapunimakozaxalobud.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/logisukoxejo.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/gememojegidigowa.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/23905350780.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/32688846220.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4b511183---kulajijiwu.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/624311608.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/82759013067.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/50685894364.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10564 bytes
SHA-256: 1c8611e5acd14531c23aafa9226caa5c8caa81f7f4c5460c7f150d93eb72c390
font_02_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 17720 bytes
SHA-256: 450b283bf47e7fd0a2438c12ef43af0cd49003d6529924f70d13489a99f2e100