Malicious PDF — malware analysis report

Static analysis result for SHA-256 092d7f32b5729dc9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 06:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28b8657a7555ad894bf7129a7f655e23 SHA-1: 4d5ea960d4b93e6545952f5692a93c5ea992d5f2 SHA-256: 092d7f32b5729dc993de32ce6636f65baa847db6e37c10b2770730efb529f6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users. The presence of embedded URLs further supports this redirection behavior, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=dream+high+2+watch+online PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e021cbb1b---32668630713.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jadugosofitiwen.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/80258681599.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jiwesafifak.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/rexenejajogekuraxidolam.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/37919663922.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/muduxojalexabefijijipigoj.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/29249954451.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/99134960552.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/wesudoxurafawut.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131537421935.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d00e875fc---4000302976.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/5895637130.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/24466770949.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/dikazonimiwotudaw.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/5485755888.pdfIn PDF document text
    • https://hobbypet.cz/files/file/pojavolelofuzawem.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/79421421221.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/kolirikejuruwozum.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5qu10j4mcfnanb5p6mb6fdro9p/53099611429.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/86542209051.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090801443491.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/50131204453.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10716 bytes
SHA-256: 4370cb712e93d45926f1e6a8a98c6f01d8b0e6d4cee09cd2418492044ae76b1d
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 18168 bytes
SHA-256: c546afc2c8c0ae39286f7acfcb97947daec1009c2f7f465b50dd9e3038a5695a
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1