Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de637651d8d8b61…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 17:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: baec1ba99dd9a3124129239a0227e0bd SHA-1: cc870fa3e7f5f5d553dfa23881e9165f795005f1 SHA-256: 6de637651d8d8b61f1d5dcbb5c5e3e3ed0fe82b41d262e02126828a0eb9b15d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://moscowprice.com/content/xuploadimages/file/44945465412.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7128d0dead---49024358405.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/24780957285.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d07e7609---nosifefa.pdfIn PDF document text
    • http://zerosquareonline.com/file/poliledigoz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7c57c391---96120613439.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/70898401034.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/87707611778.pdfIn PDF document text
    • http://hncastlecable.com/d/files/supenosiles.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xasukosim.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feef369d2d---56486250405.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dd407ef7b90f9b602ef5bf4508f2da48/55614881182.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/29851575362.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/72112808890.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8b55497d2ada85c3dbba03e3003b90f4/40336104143.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/terotetizijoranaxiximotuf.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/rasikazivefu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de78663d9b4---pazalokotizotivebezogifel.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9f390dfb97da98a69073262d3d1531cc/86168177080.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c646b5217---3223070847.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5d60380f8e0b0cd05acc70f3e4c3c30e/63289016676.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i85c6tifufeq5vrut64k33phb4/vadugolasazurowavuwe.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/zamux.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vilegasaxokuganibodudu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/77732618368.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210821075156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=civilization+revolution+strategy+guide+pdfPDF 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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 18072 bytes
SHA-256: a9fb50b393ab8522e3a89e461032c28b29251f7e16d322464571f82a2009efd6
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 11044 bytes
SHA-256: 95d3e29c15493262c3a589f222c2de9401c205fcf091fb4053b51f5592b04248

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