Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dba912757643ace…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d3d7aba2151ad53103a768b23dce0a4 SHA-1: 129bff83d488013ed72562f2238684a15ea5eca5 SHA-256: 3dba912757643acedcefea4f70d850c103efc33776ae7cf7f1165ab258b06cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting users to external, potentially harmful sites.

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 http://fkm-lux.by/var/upload/file/rurukamibebapimolipi.pdf In PDF document text
    • https://ifbscalidad.eus/files/galeria/files/fexuwukugepegajizuvag.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/78682095003.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/senokevidava.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/4062060982.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b71804275---68113606738.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab671d8de34---moposobikajogijidozu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b01a18b0c---65527656988.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/pixufowikawiwar.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c60069b29---vakimedelobedexesinugu.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zumafefu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f2175712476---gojirabuguz.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/duriterem.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/59809331315.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/8851458506.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2028325991.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/73880821276.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/jipenotomiruzebamubuxu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082083e55d9e---baguwugipamivivevixado.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30191221732.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5f6384ddc513c2888dd801d6811dad1c/71174019860.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/01201de290fe52348f898b0b4ddd3ca1/nizosisibokedowoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=naepp+asthma+guidelines+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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 17276 bytes
SHA-256: 4c6b8850957664366ace53536fb54a7930d6f56c710d5919944b4cde7933a556
font_02_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 10800 bytes
SHA-256: 4fdd227b6aec5ca1b401fb4517b9df73c45408c94cb21708417914f2147cf06f

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