Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8d3a816ef674d3…

MALICIOUS

PDF

97.2 KB Created: 2021-06-29 18:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3addb3a8d65f42aa1dcf497f9dc01be SHA-1: a9f7d7f5e78095a2f94f66d0a6960f35bd81811c SHA-256: 2d8d3a816ef674d329e5d8daf9d9a8543fc75051a0de8a1427f5ed91a69ecb18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from these URLs, which are disguised with terms like 'five nights at freddy's 4 free download' to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=five+nights+at+freddy%27s+4+free+download PDF link annotation
    • http://classiccar-jp.com/js/upload/files/43906234550.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d5e131487a36c027b049546258ff2b10/gatatopubazuwijokov.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b72130c9---32903233621.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0421e377---kodokuwurewepulimomagi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949fd9a83d---4956596555.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c895cd58---14004766084.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/22698008926.pdfIn PDF document text
    • http://fruitvita.com/files/files/tulitixevakuzudexujutok.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/25f506ff2d19e95cf52e525c66451f0f/91777285068.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1ea3638b---vawaranekimexiwuzawalej.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210603150331_3uuvpk.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105101130526636.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9550f782---kobagozemuziwozemopimesug.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a394f92e2760cfd5122e1149ec53805/76096372916.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856841557b3---xujaxibegatinolej.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62c3dde2---63846095422.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4928e2d6---67352942253.pdfIn PDF document text
    • http://babamoleskine.com/files/file/56399971619.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b49dbf07---58693545969.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44958bd6---dofilolutilojam.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ed9e8d43682ac3117cb0062776eee5d5/70422521888.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9562a13eaa---pemabafu.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/618937595.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7jnhfdrjvu5rs521n03bt5q26h/sumetav.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/funidemu.pdfIn PDF document text
    • 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_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 17272 bytes
SHA-256: d45642360de042f9ffc52d7fb714d20d353412ed4aa4d99b520800bce53000ec
font_01_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 16640 bytes
SHA-256: 67cd4328d5fd6e9134f1b1c85b1680a1a932e20a6f130eb7c914dfd2913d640b
font_02_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D67 10988 bytes
SHA-256: b521f98cd2e778d585561bc818df7ff6933d7a67492347132998faf4358c9af2

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