Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051f684c304a923…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 00:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c4aaf614ff0984b70d2f7f3b161978c SHA-1: eb83f2d67b7867565a2595b75757691b9a5ff68c SHA-256: a051f684c304a9238f27e339ebeb5d353e9bf6978225081269d080267eb13a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The primary URL, 'https://synerhu.ru/uplcv?utm_term=truecaller+download+link', indicates a lure for the Truecaller application. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the ClamAV detection as Pdf.Phishing.Trojan. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=truecaller+download+link PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c62741f---nimolonereligimav.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/fuzedasexesatumojojupemi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210910231219.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/18934513715.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/34530445845.pdfIn PDF document text
    • https://coevent.ru/upload/files/17723978422.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/21962407298.pdfIn PDF document text
    • http://www.depomatrial.com/file/ribojodupuxunigolu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8gv6fcmli7565bsgeb68afo0i0/bajakefibirob.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/83379606029.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/54920674153.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/48513500142.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/12084949166.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614401f1413b3---9380248930.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/65265239980.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/36173336350.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pkpds722lqc5ad945magkqecru/85574948832.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/boseloli.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/norezewabuge.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/4284534957.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda330e9a4---kanorusowigezo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a4fa08c8---bibukafisedajenodusupi.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/35654820766.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/724eca0340f8266491405880ea80d235/kuzakopajagoxubir.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kavuraxafufimumabewowen.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/83163809512.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/43014877571.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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 19248 bytes
SHA-256: 09b0a197fb80d5b49267a39947ef5d4e1ea859f39e8e67a671ce371fc5052e54
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 10336 bytes
SHA-256: f5ff36063c59a524e4df76759b5234a1361af564b6ed7374c94fda485d5ccfc8

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