Malicious PDF — malware analysis report

Static analysis result for SHA-256 c654cacb369b5f4a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f03c73fdaf2cb3031b63011af1e4e62b SHA-1: b17ad1f3de7a811a55d447a47980eef37e957c52 SHA-256: c654cacb369b5f4aaf6a0a6fb4901b58edae03611f2e052aeb98f8a178bfffce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a link farm for SEO manipulation or to host malicious content on seemingly legitimate but compromised sites.

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://crewmak.ru/uplcv?utm_term=history+of+shivaji+maharaj+in+marathi+pdf+file PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l3pu1m4qofkm1kjfgtp9jlmvv2/25627889307.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/83569030012.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/rawemonizivoluniguluwopo.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/38443958422.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/45985445638.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/mewosem.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/66131585675.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/78974286304.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b2ab5036---batoweduwepudozudo.pdfIn PDF document text
    • http://mobiliteit.nu/files/82776308516.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/86020300574.pdfIn PDF document text
    • http://aven.su/userfiles/file/77460594024.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/br8dd9rir1todiba9f8p1l3qv0/gegunibabatuwejutibefava.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/18219043590.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104291942547491.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/da7904a75c0fef15a0ea9836346cace8/ripedukeketona.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zeponij.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf358e51c---xuteniru.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/nuxinovekirete.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdd3856ee---55032996806.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/8540791523.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/70094180180.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/43958985851.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dd71c4def326bfab86222f7b5aee2a7/12682309148.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/babobefabadobub.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 11064 bytes
SHA-256: 887a59c574ccc90b512a2e54f7cb0649f4e08d0cd652ebdf19742414db63e18c
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 15900 bytes
SHA-256: 671e2aa93d9a92823c647ce1c71e89d8ca3b8bc7de5ed4d73a1a2d6410288fa1

Open this report in the interactive analyzer, or submit your own file for analysis.