Malicious PDF — malware analysis report

Static analysis result for SHA-256 62839af77936b695…

MALICIOUS

PDF

97.4 KB Created: 2021-06-26 07:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e388f46948d70a217bfefe37bf93f4a3 SHA-1: db4592b7434ba898c8e86d1ccd71b8db3accb295 SHA-256: 62839af77936b69515b5f6c64b2f3d7602f2baa23e4f94d398ce15b1c4359ebe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/01b451dd0564a22a036e356785665d9a/47094943845.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52c5661c1---26017050132.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba29408fbd---83834673551.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbd6f35d3---98538854050.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059dd8744c---86787384738.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d616bee1208---rotipaleza.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a536d25a---18972073013.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e2f42c0a049dc3095a7d35879361a605/potalawipilasox.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c6409ee9435c04d7d214d1a4318f5d13/fokonatesuwinaro.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/45419392551.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a82a6018---sisapozunekazo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i8ni76508iliu7i8s4gprd03sn/44150452061.pdfIn PDF document text
    • https://andana.us/files/files/96646064416.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/30133875507.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/popamitizijomo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gaab7trbj9k03c3m9imvgd2bv1/98970805023.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/doromoduvojetus.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/tisiz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp41a93i6paukamjr4n8oan06b/wamulukewodijigexu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/51524675859.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tatalikadexetadumu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/89d309044883ac47d9ba286010794a55/mosatojizegoworumevo.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/belupedimax.pdfIn PDF document text
    • http://capital96.com/userfiles/file/81499279397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=song+il+kook+and+wifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10416 bytes
SHA-256: 13ceb6899da0aa7d03c1912e2fceed9b4709b58eb6a7616ee483f4e210d6160f
font_01_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 2204 bytes
SHA-256: 15916c4f5a8eb9af7c888df9292b958d30122fce519896c49ffc46b7b6a1d258
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 18300 bytes
SHA-256: ca2ed41e01c97a2c1a774e765d9c801bda90a9cf4d86bc639f3a4bf6d298863e
font_03_sfnt_off00015fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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