Malicious PDF — malware analysis report

Static analysis result for SHA-256 10406c5fb74aabd1…

MALICIOUS

PDF

79.2 KB Created: 2021-08-20 13:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c845b00143c1a916cda98248ce7a39bc SHA-1: b5075ec38326e1dc4a0178b1eb16efaff26ef23a SHA-256: 10406c5fb74aabd1ef3069fab2ddd73b8b26c757f8eae5a79457c0c85c8dd247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=fundamentals+of+financial+management+concise+10th+edition PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/dqmlc309vn4rc54qoaobmjas94/53266849619.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba16ac3bdc---86655456927.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/5913690473.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zewifo.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202108150115103261.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/60040723902.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e4e5e2e9---nofaruper.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/rudekapa.pdfIn PDF document text
    • http://rongqichem.com/upload/files/bazuxuletuvozabe.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • http://abnicum.com/files/file/42048542279.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f7d53f9---fufate.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/72112636482.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328891517f---pavutesetaxozatejokefud.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/81769690785.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c201c19---55799984228.pdfIn PDF document text
    • https://hssanesteban.cl/files/wowusa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/746ef67bcc5097cdd6311b9b62067462/83796875958.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/39389540845.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/gugafotimisumubepi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t1ti773norbnrqovroq83blvfb/60458423362.pdfIn PDF document text
    • http://93564497.com/userfiles/93027982942.pdfIn PDF document text
    • http://greece-ex.com/58657230994.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i9oksaj5b29vse75kce79125hv/bejaxoturotaxewiloraviz.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9ed4351c---telajanerevaminunubujoxop.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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16612 bytes
SHA-256: 84f514ad0e165f92733fba07d90d629aca66211cace7053e8cc4163453f7bc3d
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 11076 bytes
SHA-256: 8256b209e97e456f9ad55caa6a38cd0ade312de880daee7349b96ee53d140824

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