Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1549226a38bd0cd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 18:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00b7d5c11d36e0bb9ef6601201c907ec SHA-1: 56183868458c414aff2bf56273d34530d9377a72 SHA-256: d1549226a38bd0cd4f58e3afaf3c58f55254d5ebbdb6e165d50580631ec0cfb0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and serve further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e92aa0d27---gisevavuripesof.pdf In PDF document text
    • https://pianotuningdarwin.com/userfiles/files/70405792356.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/36614418108.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/kilopowesomapofu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ddd22cac---31483450358.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105445400b21---vebafarivalekizamowanu.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/32013084180.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/zunafigunanote.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/97255216337.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a534e80003eb33cb439e497de5a4b7cd/18829341461.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/18540698929.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/21imminlesnjbe9ooscb5qnnp2/96054478359.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/586cf6944080d1c8f0c1297721615274/22110469845.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/64237863179.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2f6ebc09---jixexixesevetunosoxuroxu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c60b027691ba76978791e8343b1a10ae/bigad.pdfIn PDF document text
    • http://vejwun.cz/images/28385210566.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729db9eeb7f---xujonifos.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/26539690896.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26f077e5c---9573467440.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/merolevovubim.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/wugarepivepijav.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/loribi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/klchg6nidl6dgb4dsfcj5g4991/7930128458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=spring+tutorial+pdf+free+downloadPDF 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://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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 17508 bytes
SHA-256: 39ccfc9bf158e8ffdd8a127cacc3c8b6ffb3732c253664d65d39f993448eeda6
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10764 bytes
SHA-256: c13e1fd8a0326450e6b2962b780b1b17c1e6201bd55ca1d69b6ee425b8179ba9
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1