Malicious PDF — malware analysis report

Static analysis result for SHA-256 20650ba85462d7fc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 18:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f0cae48292c0cb29063207cbf2e3184 SHA-1: 22835d9c54f020fc52b4fb7a53ae509ad349635c SHA-256: 20650ba85462d7fc117d88bbbc6a3311e2f4a5e79486eff70cc89360ca56d957
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a campaign distributing malicious PDFs via compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=sdk+platform+tools PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63f9c67f2---guzozedewakenogimabage.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/82632170610.pdfIn PDF document text
    • http://chinahongji.com/d/files/xuvogu.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/ribezutolugoruxagenob.pdfIn PDF document text
    • http://poliinc.com/upload/files/39638727008.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xejifanafobutepugina.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/rijatonusapefupagab.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613282602c8e5---47081519829.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/82413103171.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f19051864d---32564438910.pdfIn PDF document text
    • https://kham.vn/userfiles/file/75396873522.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/52759999677.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mvrh41k0bj5qh4k6hivl5ovcl4/lefibaj.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/658405163.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/kusekijomafulolufituwu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401e289fae4---28382019387.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/73dcb66b3bf62e106b967284f2e23c43.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/debafet.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/48915319315.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/xawijawogovubin.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf1928a6c---kodebevimowojaso.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/vozawesimujexiboxu.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lobivelepus.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/vumevaximoponapaxewu.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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10500 bytes
SHA-256: e84197b910414b0a9587ee81ce72136ef327777e73461cee0ca32c5b31c2f757
font_02_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 17964 bytes
SHA-256: f3965097065490c9a1c6b56fb712975bc53bab57c91f341666d360884c39b8e0

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