Malicious PDF — malware analysis report

Static analysis result for SHA-256 383818d211999803…

MALICIOUS

PDF

97.7 KB Created: 2021-07-24 15:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a95a4f022449143ab4f64528ead26ff3 SHA-1: 1338b10606a510751a706212f238488896e17ffb SHA-256: 383818d2119998034384685699c66c22c61f5427188cf03142b6c21952d6f7ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these redirects. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alula.com/wp-content/plugins/super-forms/uploads/php/files/6ae0d1f3be71d76c10a367362d866cae/22109074220.pdf In PDF document text
    • http://amandamaitland.com/images/file/33549319998.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/9839935bf571310598d458ac89f3f2ca/31006123962.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/51959119292.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/918d8f11f4708abae42708b12d8e6a49/41250416972.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93a66a9a4---votagaluzigolatedowakaw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/affcc1325afc077416aaea4e02f46155/kagabolozigazikodaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8bd8c9d1---74545851099.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608716a79b802---2404334775.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897a835d4d---kixonilatawomomomenimuw.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nabivuned.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/40964768235.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lafadevumovakigitit.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26675124632.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff750fe79---baderatuluveriburor.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8rff1p1ehruqr5e3ch7ffc4sfr/76071280006.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5deb230417fd81e41afb40a71958e653/47324394408.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/xofarage.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/9567157708.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dusadilanutumuw.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/10209843037.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e38b517f5---vubep.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160851fc3a7c2b---vizugimikoworokuzadel.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4cuk9dtgj1buf5e81sjb01vpqv/fovufifonugeripigepawega.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2d998c9---jurilevaxejobum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=picardia+mexicana+2+pelicula+completa+vicente+fernandez+descargarPDF 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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 19000 bytes
SHA-256: 5bf2149b584b394ff1de818356db8fb66e90bddc15b7ff04f91310ac5a82c924
font_01_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 11412 bytes
SHA-256: 41e7b6524f11cefc49d10e811c991895f70a699a5824c70c2201e1ebb5dd0e05
font_02_sfnt_off000147cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CF 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00015d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1