Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6450b67b3f2767…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 09:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 532f941b67ab3fdf94e57662e06a27a0 SHA-1: 76febcc827006daadd6105bf6ef997365d837dd3 SHA-256: cf6450b67b3f2767eaee0280ae222c0401d3ebf51a5b55e1c8396d1e8cd2a0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=george+ritzer+globalization+pdf PDF link annotation
    • https://aartipalette.com/userfiles/file/52748325617.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77a84ab14---taresokazam.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/58901324527.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d1d7afe7---31996161769.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/xaxuboputezogazadukawemi.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xujaxawamelifivajinuzovu.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/67884364950.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/38418541649.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda744396a---batirurefafudelikosakus.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/71712578980.pdfIn PDF document text
    • http://sireny.net/share/files/63267824597.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/354791ljh01bhk65d0cd5biaj5/76606552879.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/17ca787d6a3c327eaeccd869d9bbf1c8/fifududubasifutu.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/miribubejiniletojemugumu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/54961470151.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/b6vsshjiaaj9l7l5jpv1ld99k4/93069009368.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8fde5bcf1---mitofi.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/22730108593.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/nerazavebibopaf.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075de0c89af2---moverasapezugusapap.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/46659411841.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/refomirejigarimor.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 17576 bytes
SHA-256: fec30010b0575f72d9a6f1d42cca00d6eb4a38afed6fa60357ef9789ca3c2a5c
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 10744 bytes
SHA-256: bdf1bed846d7d192a3936d65bf74ad2e2f1e8a42f99a7852cb8058de4e312c33

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