Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dba8f0df06916b…

MALICIOUS

PDF

72.2 KB Created: 2021-10-06 15:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 940b3c67b25d70460e741fdd3837926f SHA-1: fc3e177f8f2532882b24fa4fbc639a88052a22f9 SHA-256: 23dba8f0df06916bc9d5cb479903b72432131c2d518cd9dc80860a9d2c3af92c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, indicating an attempt to obscure the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=how+to+combine+pdf+file+in+one PDF link annotation
    • https://takipcisec.com/calisma2/files/uploads/buwijozenimugemo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e825a0d14---7531131598.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jukotikokasa.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/nakijuje.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27755459013.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/47783396900.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148f6a50acf9---mokaru.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/52169950039.pdfIn PDF document text
    • https://sharenkon.com/files/34241784251.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109302133493119.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/waxixofejezide.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/malirubamowawiz.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/68342977670.pdfIn PDF document text
    • http://dezis.ru/uploads/files/gapoteze.pdfIn PDF document text
    • http://punaide.com/userfiles/files/83825025209.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/21352941935.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210913141207.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/xazuvifotuxal.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/77683179232.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/fomexu.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/32363750723.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1d98b7f68316976906aa8b55e5f35434/vegerusadedod.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xiwoxav.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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 10568 bytes
SHA-256: 55d7a64d051712e05b4ed1a8bd83d376ed0d52446e7bdd62426ecd5fffa2a824
font_01_sfnt_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 16340 bytes
SHA-256: 4b0c6d3e5642b01fb1a642b0f07dc86d392edb08488d640d51b3aca2e0563f67

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