Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e2650cb32ab88a…

MALICIOUS

PDF

93.6 KB Created: 2021-07-15 23:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ed0e9eb3de62764c8d5b8aaaee7a322 SHA-1: d6c3b11da441f27a22e0750980c5ff3274d1ba97 SHA-256: 91e2650cb32ab88a6afa3de2f163d81d87c73f118b0f08340ff6e55971666326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The PDF structure and embedded links suggest an attempt to lure users into clicking through to a malicious destination, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdc35624f02f481489ea75d06080fdd3/40785669336.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/waluzoror.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16051d471e---11561313433.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210703142118_jeg4sh.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607297675dced---dokiwepalobatepisugukepuz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f491e925d3---kesisatefuvuzodokikip.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/1237392642.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606f058117432---22678125582.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/jezivij.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2f72ed8d---2216668505.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166743ddf4---58968715869.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a97a91509eb---93704874902.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/wifugosal.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/reverebujataxag.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/lemekosajuj.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/mimokugaru.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/gedepofebofiben.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/32526817457.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d9819954---gizomuzuratelabem.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/39383783258.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/bobikesuxuvojilax.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/37110814004.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/8926365773.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf7c8c74---ganepuxakosodovoxexizaz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ccc08a98288ed104f0158d8a28b6fb8/zexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=example+of+rough+sketch+in+crime+scenePDF 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_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 18264 bytes
SHA-256: 9c3f63be879c2644fde36b190d8f84bdf1d95b775db781194d42aee67fc355a2
font_01_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 11204 bytes
SHA-256: 669147039200a390aeea0ffed3f19d8aefa89f83ba64ba56a2dba30482f8720a
font_02_sfnt_off00014ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1