Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ef3dfcdb661efd…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 19:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a088b2a7cbcf7962aacf012de56bb6d SHA-1: fc63e4e56dd9de9ecb1a80281e366cb17350b36f SHA-256: 48ef3dfcdb661efd7ed9d2fd3b57679a9c0fa335b51d7b2710ed102e581e792a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate these links are likely used for phishing or to distribute further malware. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/79d38275c1a03b2ba5db3114c981b6dd/7964649000.pdf In PDF document text
    • http://limuzine.md/userfiles/file/65807607276.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d42cc44eb---pakibotezobe.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5ac0bcb4---81244126003.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/jonanokubov.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/12hp8uqlh23ubpnedl77mgb57j/67591385523.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/65641431383.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/puloxenadikozawudavafanos.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714f1a35e78---24184460405.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/66773011736.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608999ec83d48---84304952719.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/74830440045.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5ceaaq1o05jg4ih5e7lhh242fh/gorupewisuzetudupuvexo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38628ab12c---zutijegupovuxoxomikadif.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sgla3a003nqlebvkse80kig0j3/dudijakujuduputubo.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/luana9kns5aq8oio65fnt9bf2s/furavaletexonevowenogi.pdfIn PDF document text
    • http://gyobel.it/public/file/66061323533.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a96409e7fb4---37496679230.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/53046406404.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5211mln045paat6n0n5kmig3t6/redugana.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/d0l2cgfsgicdbo3nfa037mhhi7/lurasokiwedose.pdfIn PDF document text
    • https://rintrans.com/files/rawomodudegafuseputebowa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d7e7d351b8ed012d540e9c0491152d1/53059848541.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/70605634490.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2edc780830261aea91f8ad689df3809/50723815983.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/63669669501.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/muxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+any+answers+onlinePDF 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_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 17068 bytes
SHA-256: e712fd7d043424d87320ad0255fc1bb5e9a5e9adfb154a9a35e069ee2d17cc17
font_01_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 10540 bytes
SHA-256: e283f09daff7974afb2e61940511d47341e0acc376b4918ae8b62ea4a5b052b7