Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92cd7db8482cea8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 04:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 806de51c02dbbf0a59a3d7d15ccccbeb SHA-1: 2c3f68ed853f75ac10e4e4d88413a9e9a318fe81 SHA-256: f92cd7db8482cea895f9005c35b8618858b2547a02482cdb796de3f1605e968c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akilanews.com/ckfinder/userfiles/files/72184948241.pdf In PDF document text
    • https://all-stage-meditation.tw/uploads/files/61368425b1e22.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/44657767524.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d9f8abcf87a1b8a4a81476b62c2b876c/tazoxenazin.pdfIn PDF document text
    • http://dsfly.com/uploads/files/dalekubimozi.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/logowunejulewu.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/14343980168.pdfIn PDF document text
    • http://machin.kr/userData/board/file/fiwepoxawe.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/16722502948.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/30269593545.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d21a8b7d---97389836949.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/79474380395.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/gorevudorosumuzopenufukog.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/feveluzitagimevitaw.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/1977865202.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xemizanededemal.pdfIn PDF document text
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090913072873499.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210909072603.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/balomo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a2c497a64b097f38b8e5fb3df7556a52/72782156756.pdfIn PDF document text
    • https://tivicom.vn/upload/files/92200719782.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/46804172776.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/64990503103.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/33143432861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=descargar+gran+turismo+para+ppsspp+androidPDF 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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 21400 bytes
SHA-256: 474f1cf2e6b29a37a6155a8b84d3476d9e562bc01758bd588c1706931ed83f23
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10912 bytes
SHA-256: b5e2ce6754e32940e4ed02900d4a29c03610b70f7fc2eab1033511a2b00693e7