Malicious PDF — malware analysis report

Static analysis result for SHA-256 646dafbe829c6b76…

MALICIOUS

PDF

140.2 KB Created: 2021-07-14 06:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5104480990c051254f6db4b099475b74 SHA-1: 3222b897acac69f7b6ed5461fdefec1ba83bf5ea SHA-256: 646dafbe829c6b767b139f8a1f9d91b2cf475f8130f0b6d4b3f85b2e8e610b0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160918ef97ab7e---suwefuzofojaru.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7433101---tikujoduvivonokame.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lavov.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2ea3721499775b3f2c295461e4334e59/jotusupotarolojeligel.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kik2ktphec9m0upt16vp8p75rg/40234760503.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/33257005701.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee4a2d3e9---sudutupusuligukududavuwot.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8297992d3---6791150152.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/92881518178.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070307a9dcd7---fozivoxemerarewizetuset.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d9c463e6---70279597204.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ugs3hb9065glk0n52hmkkp0sp6/libonajulobemibenexevu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bvqt0vjef7g1tef0c1vidmfda6/sutajomu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cd248589---dakizikufopidewi.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/11272203067.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bbdee838e952ad9377f5fbd667de8f48/gokulobokonimesuwepoxuxaj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086098f9b667---jodilusexebibarojazisuwob.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zevidijegipetavupibo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/kifedujamikajepoxowupuz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/os2psnmrh7oqk0eqs28pvfueq4/41044546169.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/80620fb5f1407c862d84f08efd049429/77002425009.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/pimimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=centrifugal+partition+chromatography+pdfPDF 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://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_off0001bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF5B 11144 bytes
SHA-256: 8a1f1b4c9965a537699d1b75ca1a4173156ba891a22662509644e5d8dfa127b0
font_01_sfnt_off0001d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F114 19880 bytes
SHA-256: 14bb1613f36867ea24a9f697fc23d53de732ab9d4edb6de3bddcd8e9a4de5e0e

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