Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1ff791a9b231ef…

MALICIOUS

PDF

93.5 KB Created: 2021-07-03 21:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b4ae78571e85dfe457157aa709090130 SHA-1: 317b005471e3afbc4e47609d08d3b1cac9ce754e SHA-256: 8d1ff791a9b231ef948200c95a23c2e86f4a5778044729ccc5af0c2d664bcc7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, forming a link farm. The primary purpose appears to be directing users to malicious or phishing websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://archism.ru/uplcv?utm_term=penile+prosthesis+icd+10 PDF link annotation
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/me1iumh84a5ul9fg168qgeunl3/65255399365.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160954b109cc30---nupazunadu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e82846077aaf75a0a410e28a0cb85e0b/gesexenorenigerozevox.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/46855092583.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vejopiridirigoriguje.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec4540c42---94457194565.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/sozovogekobo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ngta3rs5depmrba2o462nqjhf1/wikotiwudovekejojopolubo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/22552209940.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d47bc191---vedewafewi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/a8gjcph62vbn97cblgmsapunoi/wivegive.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7051f79c---89385681900.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/sipulibob.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/49251052951.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078f75c9face---xumijulowenidetagezalozu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ei22fv2pljj2pd85ftf0q2gv21/75126084282.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74ee13cee---32128159088.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607addb819bbb---31732331434.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8d2c8d00bcfd45213b1d6f9eccc24574/74267890573.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///6081125647.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e87c193c3---3680937747.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/71965775005.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zezewadoworazuboduxe.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/56392485111.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a775b7e225fadc7eb5ead55c7393d811/98691622834.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a935a139a---62307522707.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 18240 bytes
SHA-256: 251b12ba8fae9707d7db7e7f9d7d4a88b54fb9016318a93938f3b0a677c22d9f
font_02_sfnt_off00015077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15077 10624 bytes
SHA-256: 2ad1236966b7c1c848de1af1cae9c258b943f0c88e838c602db70554ef60329d

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