Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82026b5f7d874e4…

MALICIOUS

PDF

82.5 KB Created: 2021-06-26 03:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79ee14babceae4c0f1e83f01781c1c04 SHA-1: 002ca9ea33c2f05259181a949acbfa51c69c0458 SHA-256: d82026b5f7d874e484297615e178964e13b3e19b0c08bb12156ac6b8678fb014
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

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://drafthe.ru/uplcv?utm_term=animated+chemistry+powerpoint+templates+free+download PDF link annotation
    • http://alliance-ltd.com/userfiles/175831884.pdfIn PDF document text
    • http://fruitvita.com/files/files/20732114758.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/34572316850.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9541a203---99024803564.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98921009376.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a58323ee---luvoketakepegitusetibi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/20da3a7c0d8eee1479d04de2d6ed1338/76479259122.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/tijebozokelufenin.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/28802040.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/genirimiwaxedotebawagavu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/834215d755a89206cbbac0bd0114fa26/febetufed.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff3a8e855---95284344744.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/fosulopumobiwozol.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/46018532428.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6d3095ad---74420708725.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106131720301075.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d9243d73---watorudesowarimez.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/rokutoxobolafezekuve.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/b07l6qob35o8foa2uidecv58bb/40587077776.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ae3f3b52---ritefobozezowijatixa.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mitobigegixa.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7de4a169a---boradizerugefome.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/panojudedaxopezelafu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b83a547a---fobemimof.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2c507670ec959a12bf5082aba93e603c/4397467507.pdfIn PDF document text
    • http://tencanpowder.com/d/files/52534507165.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/872317d60602753900317b3e2fc1f035/nijosajinenoserufuk.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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 11068 bytes
SHA-256: c1fc014d95263f222dfdf4a3c78a1ffe5ada39680a6d6db6fd8e2ffecbd7feea
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 17340 bytes
SHA-256: 6dab149e20403e7ccf3d3550d69aaeccfffa61dc1e8b0de4071cda8456161c67