Malicious PDF — malware analysis report

Static analysis result for SHA-256 d516180a254bc35b…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 07:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e44ac421a786a39d8d3a5420a0787198 SHA-1: b5ae8bbc02b087cd42cad2298c99e7b94e2d60ed SHA-256: d516180a254bc35bf4a8295886a4c552baf9f266d9a618d58a7de577eefaeb23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=free+choral+sheet+music+download+pdf PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nhgmi36n9c45nuvkfrdda0s1ur/ragananumefe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/dexekewigova.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e996cd9a4---porewiwire.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/gelobobakisuzajewowoves.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/17724c1621b34e5c15907e7f37c07251/judajim.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/o814q0bgjdn1r9a8dcljrrn5kj/89635007551.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/8ebc1c11ba3002be94ffabf947b7f619/fivatekadopagedozeke.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/30960177618.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/71f45268eb742342e2bea15dfc6fbc5c/2251375174.pdfIn PDF document text
    • http://mlight.cz/archiv/file/455679318.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/vevivudeperowosokil.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b9efff764ee81b998e1fd5a53ec83d4c/xomelaxesinobisusuv.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d6a15e49---73085300945.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079fa13582---76896628145.pdfIn PDF document text
    • http://ausafe.net/images/art/files/dolazeb.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210530113421_536921716.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5h7ph1njlltpth8hh52vl0u02r/rijinefobopudinad.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xupadisugufedaxikuse.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/zutivolibejewutisexunitur.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/debajuxibogibege.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d66888fe---38990446291.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/dufok.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/41b8814283c4f3b07f4e56e9af40f74c/tilexunuzote.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/jusoduvoboxisivilipujesov.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/sixagazifomakefepesijute.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/d83pstkojbk0ldj0h1llf5ciip/58625689096.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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 11048 bytes
SHA-256: 429e41e3e9614542538a5700fc64d9dd86eeec5c952f10a199d2f056f6cb09f4
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 18040 bytes
SHA-256: eea3cb68b730a1eebcf72656a3a208315a112a67f86eeb4c8f6f16c8e5808e4c
font_02_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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