Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b2294784281879…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 10:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66e80ea20c1b7741cb4d57a4f62e06b5 SHA-1: a5c291295294b6dc05fe959e8975ae4337a12445 SHA-256: 48b229478428187905dc65dad3f12f1cf1bfce4f13e28f7a8da5730cbb1e5780
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

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://irlanc.ru/uplcv?utm_term=lt716+watch+app+download PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/51328959410.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4cfc72997bd8d7016d7754b5f78bfbc3/gofuzi.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jetataforofimidexafiwu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/pokexilevut.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/63775030995.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/rodadom.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/vawejufomagazamev.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/nowawexer.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mimopebativaravazi.pdfIn PDF document text
    • https://datenglagi.com/contents/files/xesosuxukoxezinoj.pdfIn PDF document text
    • https://unaizahic.com/Files/files/17870851118.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/wasabate.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131156a1b377---40560025532.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/14071145640.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gadiduvokanatumuzuduw.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/derikedoloxidilurefaxev.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/kosalowiligokotupudapene.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7c892816---72078816146.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443722bae24---37380801822.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2951ad4ea---81297372853.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/87646495237.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 17504 bytes
SHA-256: 70c2c80251360d5c558f6c5fdc6461525d119e41d5d123c55e4bfcf865ed0c15
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 10432 bytes
SHA-256: 4f2595d9f3fe79ffb3f6cf2ce2dc182c7098c3aa1ef5f49a825ecf90278793b2