Malicious PDF — malware analysis report

Static analysis result for SHA-256 2198cee4f3d65170…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 16:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f74f07fc729470f21585ab05e22289e2 SHA-1: af77feda06fa04c6079dd60d44d0048470dc0f24 SHA-256: 2198cee4f3d651707378c477d04a7674978545b0e201a8b0fef024c39c6a72ec
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccaf47055---jugotenakuxage.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/03ae1181086bd9a516a1f32dcfc7fb20/warejeva.pdfIn PDF document text
    • http://debden.org/userfiles/file/76414192237.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1989f28deb9b4d1c315c0270beb86e5a/78256682620.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/denepijisemolo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f693e2---zizelegenokodijikipu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/rusezadod.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/24110600550.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cn7it5tupup19ke5tqbod07qo6/waforizutuz.pdfIn PDF document text
    • https://bursac.net/userfiles/file/pafuvitiguzukedu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/51163641833.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdebad95550---napulologofero.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/slnfnvrajn3th1dfb7005kom1i/33066580621.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/83178101807.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/3473234947.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98376301907.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c3b83d6e---91863359132.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e3b19033---1704356703.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/bazozimorat.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ae7e8590---81765676243.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a11f021a3155dc223ecdf242dca208c7/vazidus.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4q65l513ka6b2cbagpq9tt58a5/60658224876.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c7mj6f405ob1jj2m1vdlkjdv3b/8069528369.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/61702549485.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a67596a498ff1f1737c5f8c4aa5327c4/lemiboso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=good+moral+certificate+from+schoolPDF link annotation
    • 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_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10676 bytes
SHA-256: 46db57db101a18ef63919579c0a1f27f57b9afe70e5c9f1ed77eb0818fd7a21b
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 17076 bytes
SHA-256: 90e8cdaa9e3a4abe25182179a325a8175c7beafdf4a014069bd72d0384e004d9