Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915d925b2e2ee3e…

MALICIOUS

PDF

103.7 KB Created: 2021-09-05 01:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5043529e743c410fd3188decda492a62 SHA-1: 90341b3c5b32bc4e53f8dc9d2972d0eb716f0f1d SHA-256: a915d925b2e2ee3e95916b0529cb9e673d8e4a87207d4c5a77bebde85c5bc38e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs hosted on potentially compromised or disposable domains. The primary attack pattern involves luring users to these external sites, which likely serve as phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://inwebjor.ru/uplcv?utm_term=rachel+carson+biografia+pdf PDF link annotation
    • http://dobre-jaja.com/Upload/file/wosiro.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/77127069787.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160debeebb7d9f---17006037775.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/31839496082.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160848e073eb0d---kotalagexideremiwesafado.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/10162372604.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16098537e86b80---81465380353.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94067216ac---49273043135.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aaea31131---21067173696.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fsp975b7ra5ahfvvnjgkh21a84/meverolazukisizazisosave.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061a68ea1f---vakiwifalaniledudoren.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/85674821937.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/52633462547.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb67feb1e4---69783531506.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607014e0a2acc---xadajiro.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/xuludod.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/32350350704.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xebezubewobejeb.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/5455158474.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/nerilifalilazibale.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e977d07491a---12505069946.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82044ad83---fuwafuxaxigenuxok.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/58589062361.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/40738774858.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mejosetesasasapuko.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/91891571693.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8b95e2559---29889192442.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_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14716 19028 bytes
SHA-256: 2175e98add4c18af7c08604468e3dce24ce07302a2db9b2ab335217cb43e5faa
font_02_sfnt_off000177cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177CC 10988 bytes
SHA-256: 2935dc19b469353be11d7f23586611f467d4e83f5be6ef71b277c9e3badd37b2

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