Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b2cd356ddb303…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3898649ac94430d3db2a92a985c4a237 SHA-1: 61378caf42ca86e759fd33bf8d4182cadf9a4721 SHA-256: a83b2cd356ddb3035ef7067805a30d0a16dc10df833edb9954fa4d1be5f7d10e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=paper+cutting+designs+pdf PDF link annotation
    • https://tsydesign.com/userfiles/jws/files/72305933671.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/78181759552.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uffes5ebjirjslhl0038utd6g5/sefisovepolajobefasife.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/57980255680.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/bupavenageneminiwatif.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814eed9360---kalibagiretesaxonitukupis.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f967c4eb904cdd1ee31a95dfa67ed874/zudofipirurubigepuluweze.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856602bcc3---towudubekajim.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/xumibujimufiwowilegope.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/terasixojapujadod.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e28c8ba23---savigeja.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af14ae4593---70207797651.pdfIn PDF document text
    • http://selidbe-beograd.info/files/liradojokagos.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/buteta.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/mufudaduso.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/31288292209.pdfIn PDF document text
    • http://jainfarms.com/uploads/84595098358.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6ce1f9480cc030606e85dcd9a5b52a3d/luwipedarumojanegurajo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be6a275c2---10668843088.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6090ac6e---xodemorekudubadode.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/rupesod.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/rumedibokezo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920a15c904f---mawavex.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nupetuzujetimopesemurip.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 17404 bytes
SHA-256: 4975684a4b25ec2e4804a4764c4c9eda8dceaffc710bf2f3a1bb0f95aa06a2ed
font_02_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 10732 bytes
SHA-256: 57b8e9e4949d588fbbe2a5c762fbeda80ba367c0a9784fa00aac609bbcc6f5d4

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