Malicious PDF — malware analysis report

Static analysis result for SHA-256 befea2a53e259db6…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 00:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c816e568822bccc27e5cc4eb3c53da93 SHA-1: f5ed8fca6661cd814e927a3ffd1680b48aaa7233 SHA-256: befea2a53e259db604e99db554f1603a1a8751ae040acf617e07213dd23385a1
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The heuristic firings indicate the presence of external URIs and a link farm pointing to compromised hosting, suggesting the document is designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=tratamiento+farmacologico+para+alzheimer+pdf PDF link annotation
    • http://champaigncursillo.com/userfiles/file/10972791413.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kf4h0v56515mu3887e2asdkf9a/57002522871.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/givedejamusatufijuw.pdfIn PDF document text
    • http://splogservice.ru/content/file/lolikobukukago.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/29651624675.pdfIn PDF document text
    • https://limmaginebistrot.com/file/34061640718.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69774bf9ca---98747508453.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/25405694115.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b552d021b7---fuduxawolesibi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6e808c70---wuvejazuninuvirajax.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/58083803009.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86726395464.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba440ef97---jovadekemazoji.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/jufifewuruxowenud.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801af37e6e.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/diragigezuzevozejuna.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f323fa7cabf529654387fcabca75038/80716554392.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c416cf4c3---zudadurafoda.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c18c04210193eb9892746404e3d8be50/44007727484.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/98639723203.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xiviga.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfbb18e60---liboxakikusi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d39c0c1e4---54128309078.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/55447526902.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5togd99es1q8ujhkc0ko525h26/72842220265.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3o4e2htho724omoj45hthju5a7/xeredogupemekisekufijusut.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd66507d47---21949381994.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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 20036 bytes
SHA-256: a79b579c02aff1b3512016b437ca940cd4818874d27765d0a3a3893925c901bf
font_02_sfnt_off00014286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 10920 bytes
SHA-256: 4da0d3ee10a05b2de65cf789b52d60eed615788d85031435a11613ab4a2ca911

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