Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cda6908dd792c9…

MALICIOUS

PDF

94.8 KB Created: 2021-07-17 18:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9580ac51490c2221383ea62753ffaa3f SHA-1: 1fbd0bd99d7f3ce934b548adb54bbba7f11f681e SHA-256: 02cda6908dd792c9d927cd1c40185ec2e1620947d3b59325b8c831c0717247b4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. The document body is heavily obfuscated and unreadable, suggesting it's designed to evade static analysis rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://bestofbucerias.com/upload/file/doredibujegevir.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c164ab4a36---33946551141.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lqjv7eipculf9ld3f9a4ioaslg/20757276537.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/41090448535.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb38fcfbf0---komisazunefosizigi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/52233033882.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732023ea905---zorenezefine.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a3e8a2d2---napalekivelefi.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2283643683.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/95272128242.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/xubitelawawepadigijo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nerewejexovekuze.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/21345034659.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/dilexadakibutetifur.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c15b34b2bbcf416ccc0b136368a09f13/69961652030.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/4349972060.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/redolazuluxuzusofi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8416a6fd2623e96d5def6df29e412a9c/56135639898.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hbjb502fq2pme401qldeo53i3u/86166618356.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/kosatodogofudoku.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sivelejireripasejosakal.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609300cf7f412---kavudugugukolejufebori.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9b5b4336---39976721368.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7102b4403---78897264722.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0f3b8d2218402496317e97da90de8bf4/josixiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ielts+general+writing+examples+pdfPDF 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_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 18148 bytes
SHA-256: b4c0be343a6cd7b2df63f52fd30868d018c8ecb347c876d51320597f5b20128c
font_01_sfnt_off00013cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 10860 bytes
SHA-256: 2f63186685bf2d9877e6edaecf08be707f6c6f46dfc5b09e9884eaf8d7bd2ae0
font_02_sfnt_off000155bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1