Malicious PDF — malware analysis report

Static analysis result for SHA-256 14af0b47939fdfe6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6106ecddb939ca1cced94b633f745b84 SHA-1: 0787f8c9ce1e4b7478b879185c0386eed94e73c6 SHA-256: 14af0b47939fdfe6de65ac914f6a8f9f96881ab0f067acddce5d98763f203d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users through multiple hosts. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=android+see+hidden+files PDF link annotation
    • https://angem.fr/userfiles/file/jekorofolabezitunobakur.pdfIn PDF document text
    • http://xtra360.net/campannas/file/29427842647.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210916_52A8C7FADDDA8251.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/28498510204.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e4d6b33---gosuropirupot.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/4830739466.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/60804223070.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/laxakupojolonufilo.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/13317200891.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f85f605e687d05993dfca392f517f57a/davofebogeriva.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/12736717283.pdfIn PDF document text
    • https://biodez.lt/i/File/lerejo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/29510975512.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/nafozigoxuzone.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9de1ab36---judilogisimagaga.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/wojajegeleko.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nemelekuxusevuri.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141385c77d2f---lavuwokoravab.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/vibupipuko.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/sazavunuvajokoxafekuxe.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/xukilonolosafino.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/fowagipuzawilozu.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_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 18392 bytes
SHA-256: f091da07f52d1935e3355fffdc47fed13c02dc6f8289f355c0b22c481ce3e083
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10172 bytes
SHA-256: e960e6ae3af3e7047724e4a7f86756d4d36fc4e4b8693541ce208da09f568b95

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