Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec242bd9b8ea39c…

MALICIOUS

PDF

117.3 KB Created: 2021-06-25 21:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d70ca4d09dbeeadc601b658f9aaf1150 SHA-1: 07eaf6149d39f13db9dc8b885f30e707f7f32566 SHA-256: 0ec242bd9b8ea39c8db5ceb8686e72f50de0149845bcef2d62592272406687dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://samngaimarble.com/html_upload/file/83058841289.pdf
    • https://chezgregoire.fr/userfiles/13039167083.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210530_23E89FD40323CFF3.pdf
    • http://101-games.ru/images/uploads/files/bewajadosepanonas.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/gokowokazuxebuzeduwovojiv.pdf
    • https://fallsplat.se/file/87900171780.pdf
    • http://hzdsbg.com/uploadfile/1621231844.pdf
    • http://brandiassociati.it/userfiles/file/visozufiragokejonaxokeki.pdf
    • http://aplus.to/userfiles/file/luvadixe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4981b0d0---xufavafovolegumenejolixu.pdf
    • http://group-anons.ru/userfiles/files/59583808612.pdf
    • http://bakoca.hu/files/file/basutilos.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89e979f86---mikibogalowor.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657213a56b---lijakavevejaxitetita.pdf
    • http://jhdljz.com/userfiles/file/1624402599.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bf903d78965a7a2cb0439cc591bc544e/xufuvozetafolexaxibu.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2cf1b75f7---38353492395.pdf
    • http://www.asslar.de/downloads/jegaximepev.pdf
    • http://mynigaoe.com/upload/file/20210618155055.pdf
    • http://amandatravel.com/userfiles/file/51070136330.pdf
    • https://deniz-sogutma.org/img/userfiles/file/lovomefaguzakukafozugagul.pdf
    • https://akemi.ro/hirek/file/90398205394.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3d8dccbf---regidebuxowulokiwuvo.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090033ea1ab4---67189300088.pdf
    • http://wittlich-luexem.de/userfiles/file/62703585147.pdf
    • http://animalscipublisher.com/files/upfiles/file/moziwiragovegerokoti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+promise+of+a+pencil+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001647a.bin
0393a52748eddf8b745069eeadcb11511cb409c3dde3666e00f30fb00bd8981e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1647A 10836 bytes
font_01_sfnt_off00017d57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D57 16792 bytes
font_02_sfnt_off00019569.bin
098871c4e3b27a678a6fec83abacceaacb91da830c45023094cdbd8928c58ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19569 19080 bytes