Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a89c0cc7182d1e…

MALICIOUS

PDF

91.2 KB Created: 2021-07-31 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 319a54da871757118138839213215e72 SHA-1: 0d8bbb7cdc60e7e454b1b473c260aa5d17b14aad SHA-256: a1a89c0cc7182d1e0c651e2ad112af8f933e24dcc36a405e01258e72801f3f69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://philabc.ru/uplcv?utm_term=where+is+the+furnace+reset+button PDF link annotation
    • http://maxtarget.by/ckfinder/userfiles/files/darumevivibizor.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/99623923817.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8ela0m5fqd0rnpe95fa9bas0i3/sirifinukobidifuxowawi.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0be8b772---26769089486.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea30711816---87794189670.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gvd0b2ir0btit83rg3fkipg6t7/parejoxorurataxexuwijiv.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0be7581ef---jimijeva.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/gufobokarajidanetup.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ng5j5obob18eaovifer03s0095/pamudokufe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68f983a724---mutifoporimajagasixim.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/9b2816ae0952099629b3bd22c7e9e862/mogijopofuzatetuwubufoge.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pawunorenulelukofeki.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcadf41b7---devosemoxiba.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/51152418351.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ae6642cc---megoka.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vekofajadujokaw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c6b926d87a59012879a23c9c2239d2a/bidagelapuporisen.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076614bbefb8---posijoz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/makuwuvotadakekanozobew.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1e4921d7---94229150358.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa24f7a3bb1---86651137879.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34920383874.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/lubukajidikosek.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4a498bdbf078157e1d57efc1eb83f4ce/semozowirogejirodef.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_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16552 bytes
SHA-256: 6baeab4db3092ed2cf4896045f5f72b7a77487691437667478faa8d8d497335b
font_01_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 10620 bytes
SHA-256: b8fa6771c1d404532c42077dd4d774310c14c6cf6485e9895b6eaeee67d597d3
font_02_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1