Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d342330d68f3db…

MALICIOUS

PDF

132.5 KB Created: 2021-07-08 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 043ea850c6535cee55fc59557d741e15 SHA-1: 12a2cd3051746de45e939080c83bce7b68a476cd SHA-256: d1d342330d68f3dbbdc311e8e0da12d2ec349c990728c8ed9f52a6e3e1d4d777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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=advanced+c+and+c%2B%2B+compiling PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/m1s0g42su3uqkainumk53pv1ig/73045396013.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c04861f549515508a838bd415918776b/87144791051.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/73074773631.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a81dec0d2ae2738aa2ef6e899182c0e/nivowarapudevujotopi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/10624119704.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/97397965058.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b871738695e---73599417756.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gakobenozanen.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/jedaleduk.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fcd2ab6efd3480ac5510ecba082b5639/totakojirekudokakoz.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5ab7d41369e161bde68ade20ac616403/dukipanudopet.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c72485d33a1---93894206268.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9008abogep4fn46ukj210qtgp5/80874763910.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b5568d8d6b3---51193264930.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/3041408939.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/nowowamu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a150de6d86e---24383948680.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718b865cace---67081423018.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a847dbb3897---voweluvuxesuv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59d9b906e---bowapepamazomi.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/96045896059.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875aa43cc1b---77064000450.pdfIn PDF document text
    • https://nada70.org/userfiles/file/rowubekuzigotagowulusa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da37c32aa93---79486360444.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB4 16700 bytes
SHA-256: 263fba459c43ef75c575ca363a77cc798276f4a347a51b0e06021682a2b3c25f
font_01_sfnt_off0001a438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A438 10536 bytes
SHA-256: 4584b9841b4e59cc6523db64bf7bc99a4fe3aa8d5feed54feb724c36fc6cdaab
font_02_sfnt_off0001bbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBF4 18436 bytes
SHA-256: 4f527f600d1f3ed14fa97db9559308de6fb10411baaaea94c4122117aa9a2de3
font_03_sfnt_off0001ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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