Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f3bdab7edfeaa5…

MALICIOUS

PDF

83.8 KB Created: 2021-07-06 22:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72767db6d97c307a3188f2755f8958a0 SHA-1: c3879af537275f66e7a6fe68f2c4da5cbc8d4271 SHA-256: 78f3bdab7edfeaa5b27495fc01884170f55c4ae2d7ec5e9212cd5a2f798aa302
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS upload directories. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=valpam+5+side+effects PDF link annotation
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zulexemigezupakuxusupisu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pininikivepifasikubezi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc977ddeb---bejasefi.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/fobevexelaroxumijepuru.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828439e8c88---41529487643.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f1da2980---mubiju.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bugelozedo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6c53c7c7276c570c06bac42abea034a0/zefononujevuxanubozojom.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/962324473.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zabulemuwabudufebego.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9fd9c78f2---wuxiviwugufuze.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7494d93f59---26433284169.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ec7e15c---rikokurusedozajeriguk.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/67ccbdf1874e81921f6af5585a50a0da/xifebujepulatu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/dufeguborasojo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074252711884---tugubijogowododekufiwab.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5ob9l9q4rj0qbvp34l5mid9q3n/kadak.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1002e071---robonojizovujera.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/45855712186.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107070325426873.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e11e3502c---86667737236.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0l83jam3ja6co8in8rehq33fam/69927346332.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feae0af2be---51679597761.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 17084 bytes
SHA-256: 9074fc0e45d4f99b3342168429a324dcbae6d3b012792531107efabd30782e04
font_02_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 10560 bytes
SHA-256: 010ba8e32b9d80bdf4dbf54dc475ae72a6037952af2c0fb267521de4282140a0

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