Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ba51e602d309b5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 397394e13fd5990f1de5cecf34d869a2 SHA-1: 331d2ba755c78ec612179e36ff391279eab07092 SHA-256: a7ba51e602d309b5e3441d5eff73f6dd40f97e3c91310705b30dcbc8547a0524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that act as a link farm, directing users to various websites. Several of these URLs point to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=adobe+premiere+rush+mod+apk+free+download+for+android PDF link annotation
    • http://metabolit.ru/files/file/68331404453.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/80040611539.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/87305442103.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/13707624800.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/donexorakulokojovogewuk.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ee8e3adda---lovubiramukaru.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/11606052981.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jozodutotebanuxagujone.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/dododoraxo.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/38032335688.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/85536193104.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/lukadavifagirodosofutu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161424e703ebd6---vabumosepipopo.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/lafidejutasubelukozoxi.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12986186227.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/giganikuvigiza.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/bubabadaruxaguropen.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/3032526908.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf028e343---2106946373.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/314166823.pdfIn PDF document text
    • http://didula.com/img/file/reloburatelepiwas.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/92131676455.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/1243100971.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/urlm1d662espee1t1g7pmg2iv0/mizarenuziba.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/56742587488.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_off0000bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16828 bytes
SHA-256: 94a0ea523b0120ce8d88f18c37feaa6f2dc039e31f40f1d5da2494c05082fe34
font_02_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 11064 bytes
SHA-256: 8eb7a0355198789f08354b06ba6dc11136021d4df05de6c92a51a1e15501d99c