Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7238a26f1af079…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 21:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d4be1eb907ae477b395b91115058249 SHA-1: 45f27650afa51b22c869c5d322b492192d201fb2 SHA-256: fe7238a26f1af079d05e919f8b9e44d5903e3d9c5968cd23b7482eb4bebb3839
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=app+to+convert+pdf+to+kindle+format PDF link annotation
    • http://borneneskontor-landsforening.dk/userfiles/file/rixaxalese.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xakegavujekuxewoso.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cbf463fcfa868d07d19778b7316992e4/pafelujejuxusomereposu.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/42070969186.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57272270340.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632349372452737372.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5283040474.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/bamoger.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffec42a5dd---jonufekiderikeripe.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/poponomofowipifijota.pdfIn PDF document text
    • https://sainaudit.mn/File/kasijuwisenenu.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/26398569856.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/21425301666.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/25723057671.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/beluxepebozolopuxoloderak.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/18179459216.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/83208966237.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16142c6ea94e51---82194830596.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130008ecac5b---4947229953.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pexetal.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_41FA851928026481.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/fomususedamuvarodevikure.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/nowevazikuzimifevu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/libomosolugidoxutazazeni.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/68133466898.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/ravati.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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 14892 bytes
SHA-256: 4665f04e353f9e213932598120fb6f0e8f5a632fa1e4cceb7f143a17577bdcf5
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 10752 bytes
SHA-256: 37db13efbceea2f8522eda0f784ed9e5fce1c3a1334c258a584548ee4998ae56
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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