Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b83e7b61a8e7db…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 17:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84fa77f7acb93bee7922e0ed5a242747 SHA-1: 0682af0ca76dae694dae737ce61e1cc4c99f3abc SHA-256: f6b83e7b61a8e7dbe9ee546470abe29a78caf8bfe17a2661da36b5ad0729b0eb
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=warhammer+rogue+trader+pdf PDF link annotation
    • http://teleinwestor.com/userfiles/file/51230714780.pdfIn PDF document text
    • http://zamgph.com/uploads/file/212046338298.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xibumewajumilufetaji.pdfIn PDF document text
    • https://teamcode.net/upload/files/81547560526.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148d6aeebe75---43860852063.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f536551e---tiwegipamirasemuzuseweget.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/10058159532.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35349739034.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/nawowoxoxosid.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/kakuweranajukufasi.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/9886218845.pdfIn PDF document text
    • https://photofetimages.com/posezirulipotebadelepax.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/nijunetivobisufegebadexi.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/80625456413.pdfIn PDF document text
    • http://quetthe.com/upload/files/mapor.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147a42d2a36b---janiweximekogalegoxarame.pdfIn PDF document text
    • https://bselink.com/userfiles/file/4023579352.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/49122967916.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/35168198530.pdfIn PDF document text
    • https://fratellifurloni.it/file/46342555036.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/35368258462.pdfIn PDF document text
    • http://school15-tyumen.ru/f/65025914099.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/simogegawekuzuji.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ccb757052802f4cfaba04c4a87ec58a8/ketedipoxipemarogovid.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 17308 bytes
SHA-256: 2d8b997a3588792454f7094a74dfbdc9f07aa705939d3ae13e04fed351d359bb
font_02_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 10628 bytes
SHA-256: f3cd492e3dcf9ac92f269732a69b9448a66491ed369f86bca6376cb83d177df1