Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f603c227a13798…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 06:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e362a23ed022fe867cff1340c146eb01 SHA-1: f41556832f179ffb438856ad312333380a29d4ce SHA-256: b8f603c227a13798a6b65f2cebd157f25201e5e9b4170e5414ae0f1d2aa6b2be
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=how+to+determine+order+of+reaction+from+table
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/88kkrtiorplcp3tld014kusbi8/89210801002.pdf
    • https://e-tta.com/app/webroot/userfiles/files/rafufamomimoj.pdf
    • http://rajhansnursery.com/userfiles/file/kexiwosi.pdf
    • http://activesolutionelectric.com/images/file/92693817740.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gijenutonunawuwavexaz.pdf
    • http://babyindex.nl/images/uploads/vukawawozozemasexutupa.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c2777ed1df4---vexixilofi.pdf
    • http://libertyquad72.fr/userfiles/file/70274418068.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3ea21311018ec307ba4dd6851102ad7/83350612543.pdf
    • http://laweasy.kr/userfiles/file/povoravodig.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99614106c7---28159244813.pdf
    • https://akapacha.com/userfiles/file/xetefopopofoxekomawarot.pdf
    • http://bualuang101.com/backoffice/upload/files/11004515770.pdf
    • http://auto-spec.ca/fck/file/162836575.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07a3b25f1---81496860315.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb51b7e168---gokoviruni.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160962ad28f72a---25538606554.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/pubunekogevubunebinexamit.pdf
    • https://sport-jicin.cz/dokumenty/61414672706.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4d07bc794910905fb11bfa03242c58e6/merulupafamamune.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/753997a609ce753511a52c503493f40e/73467247651.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2a3koethl0ioq5vv5a9hlb5338/jukubuxativ.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/25262cd1c5062f7fee2b47070f0d3405/lidolomejogipufesoso.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160885d93ea2c5---11830847255.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16792 bytes
font_01_sfnt_off00012003.bin
5d2e563593164f4977ba852dd206b7d322404b18a735ce09fb2de2a1c7173110
pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 19352 bytes
font_02_sfnt_off00015318.bin
82334f234bcb00d9bcf58d45b6a3d9a105cf6b77423bf5edfccaf225ef83d21c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15318 10684 bytes