Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa3f67b5ecac7a…

MALICIOUS

PDF

108.4 KB Created: 2021-07-21 12:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3bb5da66c4353b1f631edc3aaf473002 SHA-1: f8f029bc13a07178997f69ae6f42883aa97b9766 SHA-256: d8fa3f67b5ecac7a300924b55443eab4be3f09189524920eefa27ccf6b5d9c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.egavilanes.com/ckfinder/userfiles/files/87619806006.pdf In PDF document text
    • https://e-uchebnici.com/img/file/fitesexunanoj.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009b51d2c2---vetaxenomobawaxubosifolow.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/62922399708.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160978049eb334---79501063295.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/kekedirajajotuvawaru.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fbdee5900---tebokofod.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093401a583da---84056702098.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094273a3fdd5---kalarino.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607db37422b3b---tofemawodon.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0tsb0glftjb2rjjmp6vgaldfdn/20623743391.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607596a5a0473---nikuzezixilazawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb386b5cf9---84697361504.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba136431b3---61580813869.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16236974863017.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b52be3de8---44430722176.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b333345c42---92091348065.pdfIn PDF document text
    • https://numberonerevolution.it/file/dujunipevobatokotip.pdfIn PDF document text
    • https://nexusmediation.nl/files/85876011550.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea8127ce4---72586992005.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/22698298225.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9nr3todf0182mqiommeg51a26b/nakubigamatudax.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ab44edd2be01f6b01a6beddc1514b96b/64830033357.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/zabubolabinanari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=urim+and+thummim+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 17016 bytes
SHA-256: e36b026f6426a10db244200d11c5a117207a600260a061034ed0438c8f15f0a4
font_01_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 22740 bytes
SHA-256: 29dfd5fd00b3cf8eca39d76438ace11897e4a77e212e14fddfb6e52fa2979704
font_02_sfnt_off000165d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DEB 10468 bytes
SHA-256: b7ead9c2a7384a6ef1e5fe94839c6b060b05d89b793077419436d9b638d2d4a1
font_04_sfnt_off00019531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19531 2968 bytes
SHA-256: 99ba7537a980e3cf38b236a3de993a0a5cc26f0462222b2fec379f965e7cbc0f