Malicious PDF — malware analysis report

Static analysis result for SHA-256 436fe8b7ae82be54…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 047548155551cc14781082f5821303b2 SHA-1: d1bdc103cb2370312e9b0595c0934b91fcc3c50c SHA-256: 436fe8b7ae82be54c722c645bd0bca6dbc68efaf3524899785843c27cc45fddb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

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 http://sonnenheizung.ch/fckeditor/editor/images/file/4984022182.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b7e5eb550f6e0aa2504535fc212380e2/61358392758.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/fobetukowatamabipomekeda.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/dasilobitemulemek.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/45874800266.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/putisenedirerepitaxoj.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/84498142279.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/24069440908.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pibarigiliwakuxeripi.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xezobupix.pdfIn PDF document text
    • http://dominant.name/userfiles/file/8559546810.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/67905618448.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/50019920957.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/61698163208.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/69943653216.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/xitaxumufajexegezara.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134fef78f61f---58240687699.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/79907746831.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/64361895154.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419b39d6373---befuwol.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nelosuzotikudusikirufugaz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7906a208dede144b154b390b44c99093/63449701625.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/93877302250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=legends+of+tomorrow+season+5+streamingPDF 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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 18736 bytes
SHA-256: 61bf7b3498f032ba564a99aadba4f301e167ac4f785339116e1638a71b7e102c
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 10828 bytes
SHA-256: 685232f31d279a2b60d28d5bf2dab25004e2062e0920474ad923af90dc130323

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