Malicious PDF — malware analysis report

Static analysis result for SHA-256 4299edb84288f25f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 14:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28ed8d681e1cf7d1c215b957b7931cb5 SHA-1: 95bf4321aa84186d47657c59a5f9a5605211bc85 SHA-256: 4299edb84288f25f06823e3d18d04de88ed03c7841b5da3ac016a8c208d667b5
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=jurassic+world+watch+free+online PDF link annotation
    • http://hoachathoanggia.com/userfiles/file/busiramitabijagimute.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/21935862554.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/44435767564.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/metewu.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/29745580436.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76655989451.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/fufebow.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afd127675b---xerolox.pdfIn PDF document text
    • https://websbag.com/uploads/files/35501647033.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zanuzi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/62936623196.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/rolavebisezugalarisuvapa.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/wugudib.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d73cce468---jakarawivudiwekixip.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/danofe.pdfIn PDF document text
    • http://e-menu.hu/editor_up/13278918746.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o9evqsi7qkk7cc24iss1k5l9d1/31584619693.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/15302268904.pdfIn PDF document text
    • http://thevalleytrader.com/files/nubol.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/32325269881.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10752 bytes
SHA-256: a5d18abba5d8e46c880008cfc3c67548193b49392814d5b55991eea27b52bf12
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 17604 bytes
SHA-256: 4739bf11bf92c8f036495f0a06b4f659ca1c5ca76530e2ad4398bf8bf6d535ce
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1