Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718587b55c70f9e…

MALICIOUS

PDF

70.4 KB Created: 2021-05-20 20:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f11963f9cc48b4b9f271bbafbcc5a432 SHA-1: e88d8dd4c2081060fd795a3a240586b234d9c5d5 SHA-256: c718587b55c70f9ef8bd684ba9d2edf4b1b412ebb4b63065cc0fe28c30cb9dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to account management, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://pistant.ru/uplcv?utm_term=how+to+add+another+email+account+to+centurylink PDF link annotation
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ed0tsr59l9g6c6g5r09gdftvgs/pewadusonopubalijivisuvij.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ebvrbtj2bohqb80um0bsm2efmt/wakilufafatujogixibovu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tofofifizo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/621b488753b5ccad2ff28d948b7ffb70/56409174827.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dfacd1ab31824701a754bed9d086f4fd/84599997892.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160738ec0d1531---40528462981.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85209be4b---44620303368.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aad67d2779fbf58bd3af7bfdc3f58687/7229093074.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dagogeriju.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/lomof.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0297cbb936---15564624440.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3c5e7f9426824f9ad37a284bb90d6f0b/movilid.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb14972b1---79359198361.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9c0e4f90b7a207049b10bdc9fd7e18b1/tujozoxumaxuwalel.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/46394097013.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee7c5fedb---83921660045.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a51d137db4---dizapamupubutudezamepajo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b466fe42d175ad2285a016c7d89bccd0/dofujizitubapezekez.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a05bc0be---jitesikunutifabizululaxa.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fm83sb2mcipdipc10mcvk4o42s/85933695368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 5220 bytes
SHA-256: 22b06bf711a7192022c7924b44f453752b65fd68e5df4914f8b691e2104a09bb
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10328 bytes
SHA-256: 697af0158321f6df9048440e6f61039ee9eb530f35974953c7173eba47d05dcf

Open this report in the interactive analyzer, or submit your own file for analysis.