Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9f54a5f1d29003…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 06:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c5e5cd558bfd18ba8f135fe7cdaf9b5 SHA-1: 4794d882d6c2769e31ec5272655cc9d5ebc5b685 SHA-256: 9d9f54a5f1d29003565de1151b924fdf380c2b2cf0a35cac05ea527ace404c26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads. The presence of numerous PDF links on disposable hosting further supports a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://travellightnepal.com/userfiles/file/90172033384.pdf In PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/8122661546.pdfIn PDF document text
    • http://zimmerei-possert.at/98852829915.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/boxufifuxuwukiluk.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/43728212824.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab3ff220e---kakenafogekamaxu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0muc4qmig4f2dh4bkhkdv882kt/doluf.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/desewesu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/84085066920.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/zoketudufiko.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7cc32a1---zezazuxajixomiga.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jepibawo.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/69720059222.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/titosixetenemodukidimavi.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090300521573499.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/radusifiro.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/wuvoz.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/fuxosopumonagojewofapev.pdfIn PDF document text
    • http://packturf.fr/files/jawovedumamo.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/rugawiditafijogamuxuxi.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/68416377772.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53645857331.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/50728508951.pdfIn PDF document text
    • https://brakos.it/file/29051337368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+someone+see+on+instagram+if+you+look+at+their+profilePDF 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 17524 bytes
SHA-256: 8c3f9e6dea2fee9bf48d9541b88ad3a4b2c74206bc92674936393eeccc8c5d88
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 11144 bytes
SHA-256: f0abf66c6c16e6cdf8e62738c96d40c618c76b4ee60fa0e2fb14e7faa7ef1bbf