Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef77a1c31ac4878f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 06:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1e7b15d6d8954e2cb75b0911866b88d SHA-1: a4d6b326599845fe75cfe417ae2cb474a838d8f2 SHA-256: ef77a1c31ac4878f9e75498e70e7d7f1b99870ef05a7908947bc2f4225f4c4e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term=download' in one URL suggests a lure for potentially unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gadd-asso.org/userfiles/file/virajebataneresaxifut.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pefimip.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/gapifudoxasukatajafuwif.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/17691715901.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/34116359682.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0bde44af3---zafiv.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/72397389442.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/rituzafu.pdfIn PDF document text
    • https://atiksigorta.com/files/97568266184.pdfIn PDF document text
    • https://strechybenesov.cz/content/pozaginagapipajutenikimip.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cfeedc7---kotuxoweredesefivesusutu.pdfIn PDF document text
    • https://kildevangen.dk/files/70509668578.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/2418810998.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/95922322937.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fitawuvurefevesed.pdfIn PDF document text
    • http://glassick.com/userfiles/file/powodakoluxewixaruzojenox.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/11265789063.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/kisoka.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/60876527440.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/71043964571.pdfIn PDF document text
    • http://prmakeup.com/Image/files/53065107673.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4d94d96---tupemazatirajexetedal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+pubg+mobile+full+apkPDF 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_off0000b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D7 10896 bytes
SHA-256: bb7f01ebb6083c01c7049d7e0a67053917b73fd3a088331fe1d8b18e02621789
font_01_sfnt_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 18916 bytes
SHA-256: 1a35a6d8bf5f8f5f2d69ef581f602f7a8be6b2604dac125732d2316cabf6c53d
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1