Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35609c9d449676c…

MALICIOUS

PDF

111.9 KB Created: 2021-07-06 21:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1901e4d41b684953e7539c85fec923f SHA-1: 0585cbb662246b7d0f103e8acd99dc8c7b5a7610 SHA-256: a35609c9d449676c3638aafd5f15a028ebfdf7f962966f1e527c1e6aa0ebfafe
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e07454601d---poxojuzijutizalubewubun.pdf In PDF document text
    • http://laweasy.kr/userfiles/file/xiveverirevivap.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecf6879f5---3948904401.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/96994849126.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01ee20247---mofetatujasiranepizowas.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/17c67c5d7a349cb09e14bb701d97df6b/nokidok.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85228075929.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b73775f0---3702376523.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ec3145aad---51786168873.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/rofar.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/69717697718.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7e264f1f0ad2a8f264ed1d6468eea143/vanixuwejawijumejitul.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9bba151fd---rurarivuwezep.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/tojekonogafefuxofusuvo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/xofaleredorekiponigi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/79445538619.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160752e5ff2521---savetafafag.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/pooahs266vcvc1pfq48b2qbp53/36651303770.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7a07f26ea6f4c424f3e1bc498737d496/93306458162.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/35015523849.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160825b8162a58---tufimopofuzifaz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c3476110---fugepevekugarazaloxoledew.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd51582d07---11385160731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rabindranath+tagore%27s+famous+poemsPDF 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_off000153e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E7 17024 bytes
SHA-256: 07fa5dac41c67240db0976e6d37190f0809b2a9ea8f445140dfbfc3699d355a1
font_01_sfnt_off00018073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001988a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1988A 11220 bytes
SHA-256: 888fc60943a800a8b5efbdb03d230ee2ed00962a4eae15918c19db6bea79069e

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