Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c17d8c96fa3b632…

MALICIOUS

PDF

95.7 KB Created: 2021-08-03 20:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f552e8e6e70876404ad29898f48c53d SHA-1: 38eae1efbc4d61ab7adc05f60b1d5e84d94a5259 SHA-256: 1c17d8c96fa3b63280b35d02a58888c073a2e2fc440fab1c76288a240efc0f59
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://namngonviet.com/user-/files/xezuvetusojeg.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dgg7kf262g1oohhpds8032d4rm/23602357606.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/45238979689.pdfIn PDF document text
    • https://fallsplat.se/file/tawomip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97903597021.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc9915ca9---14324088656.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/fulidiselaxaro.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/4910d195d58153bf3ee92fd4eb5c1422/nezakexejoritipovimokapiw.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/tae0prj971b702q6fmiudmec56/56495793379.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/35792618583.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160befe146cf2c---rutonuzawenogox.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/kamegi.pdfIn PDF document text
    • https://latework.cz/soubory/dilis.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/tevuvanasurumibetatovik.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc3d16ebd---43046691866.pdfIn PDF document text
    • http://alirezamirmohammadi.com/images/upload/files/48324615069.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2dba67cc8e05d7e2decd34e88c1fc80b/21879691709.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ede9ug8q8e2ragmkimenj1fa6j/33886108508.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kajagujebijin.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b68694bb6fe28c83769f87e717ac11d4/18650630852.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a3be363e---rafopa.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eb4af80ca58072a262fc23c2ec56998/96253661486.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19a3623789---21154427137.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/36491832464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+macro+in+memu+emulatorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ee88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE88 19940 bytes
SHA-256: 3630bbbb4463121eaa44396ea5113170069f8e2df6dc2aaae64781081b15e43d
font_01_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 17660 bytes
SHA-256: a56e655acd73c384e075ca04d0cb801a0f3625282e18c68dcfd1c13aa6ce603b
font_03_sfnt_off000157b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B3 10568 bytes
SHA-256: fc0d82fa22cec98da9ddf0a6a772b2ed402ac689e783add5dc87f830ec331310

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