Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f75426407d62f93…

MALICIOUS

PDF

80.7 KB Created: 2021-07-05 16:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd9a7c50f95a7a9bb99dd38c480430fb SHA-1: 7db5b1059a80cf5fd15428c4849912e4c94b65b2 SHA-256: 1f75426407d62f93023c6c9d48b3ae1194809f18b80ff501896d7e3db4787de0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kapelski.pl/userfiles/file/90969288784.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06954e8ff8---lisumaxodurerelodi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/159978468e5aedf5c49860561bd245c5/78310487172.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q5o46o60k01lmlm7nu86mkdnvo/32028960450.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/gozuzubeg.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/9915906832.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7958598f8e---wefar.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/tomifavetorodut.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pifapofosulipuja.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a94ac4ee---safepogi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8003f31dff9bf3764bfc835a29e4edcb/wudutatigeli.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd28cc121---kujidosavibazajivisego.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1cc4e9626480cd9404537c9cf5db399a/siwogadajowumeporidunov.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad4172f7---1467794651.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d90bcf07---74257519110.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xedifulanerab.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/21871370686.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/61677397264.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/73169515285.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17200cb90---vifapades.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d47571a36affc43184cb474da9f21e03/sijubesuxuvizabofedinok.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wawifolegigitevudikewomag.pdfIn PDF document text
    • https://songhong.info/userfiles/file/raveku.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/37207209775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lover+of+food+philePDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10084 bytes
SHA-256: c39408da675ba0b2ac94cd0bdb4487332bbeb0d9e3fab36df0ce0a74e24985ac
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 17748 bytes
SHA-256: 1db34bac0a8e9127a263af87a6cc69c95ad528e844b1b37d74138803c81277eb