Malicious PDF — malware analysis report

Static analysis result for SHA-256 825ffad24e608660…

MALICIOUS

PDF

79.2 KB Created: 2021-08-06 18:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 913c33bc4f2477030d662289a0212433 SHA-1: 4a8443eca2cff593ca95072bc42b4146fd54efae SHA-256: 825ffad24e608660fb123bb2abdd903d168a12edeb626eac2b846595ca665548
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. These links likely serve to host or redirect to malicious content, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d72514b57---16681538560.pdf In PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/34528146252.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06d57cd6aa---jamerilanuraragabowilelo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add5bc10943---25300184163.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/malaxemezazenogu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18207a4b4b---vumelevilevasidukofaxuv.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd692082762---31731371132.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923bad05f40---sovipowal.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/moledek.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/87948243426.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d2eb535c---kegapixere.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/tunurojotexipurubuloxili.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/41977915961.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755f5c90ce2---1695470237.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab809b6d3e5---39861731159.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/r5c9nd4253gaaatr99dtnoqjrd/1395071095.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4445e29da39b5db2bc725791e704b3f3/20805490121.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sozerevekuvixunomosujof.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/fibesanepoxov.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1bc1bc565---32884218597.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fomexavoratejo.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/59873092825.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beddf409bf9---26344856579.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a8f28e67b37f8bd30f2dc48c0f0056de/28876946800.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0b9324c5---652807886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=harley+davidson+sportster+owners+manualPDF 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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 10908 bytes
SHA-256: f91d906d41ef84b1df965b245447310743ae6752b70f405cc96567fc1473ffe9
font_02_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 16736 bytes
SHA-256: 5d8ec6739cfbd536d6fff16a314b4ffcbb3e5af9d5e0e9f51cac9b4255b1c24f