Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3ebda8b701a02…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 23:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30184df2d4fa92c5eaa5f4e7fb38f608 SHA-1: 44d88fc5d3525ab24956f3f95b4fab1a788ccff4 SHA-256: 8ee3ebda8b701a0239bbc5da8ad6f742b99b1aa65c8a03147443ec7fbac5ceef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the primary attack pattern involves redirecting users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=choices+stories+you+play+hack PDF link annotation
    • http://karinameal.ru/imgdish/files/jegajorumeba.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/45020504339.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dfa00fd---89889856490.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/62475601263.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b05f72ae0b25fb08f92d86f7b1ce59ee/3280535252.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/fojupenebuxiwux.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8490863287.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986282be48---63624062602.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132e18101a2c---gegirejag.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa0ad478ea---3069975425.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210918194644.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/86435507278.pdfIn PDF document text
    • https://luminex.pl/upload/file/89058473729.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/26023938229.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705e9ecf5---8103265617.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/22091434741.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c6cf6dea9018e40a3aa97be8468b6814/siwomevavimadev.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/55063628255.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4su31bpcmgfstf2k2a2cpo1617/bodaropazikowupexut.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee13d1d6a8---finunolikuwegidej.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109252056557198.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/64635039168.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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 10704 bytes
SHA-256: c3cba86f2e5614c3d4a683a682563a5f785e09f60b589340a4a925e0d19267be
font_01_sfnt_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 14832 bytes
SHA-256: 441ce1c955ab3ed02608a0f32d0cf8134fdc505e751143f52c1fe8d2cb4fe0a8
font_02_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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