Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e723c1599aa7b4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 09:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 462ecea5832fe36f8b038cad1228d98b SHA-1: fd73260f935090318c27271f43e33c2097ecee41 SHA-256: b0e723c1599aa7b4e6c8c7006f2d6ec3164b6caf6396a5cb4556064cd26a2ffb
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 external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=difference+quotient+practice+pdf PDF link annotation
    • https://chataigne-cevennes.fr/imgs/files/53613101161.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/37360464464.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/figijilobewulezos.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xadog.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/wariz.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/xenijojemerafukuvin.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/4881845300.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab204c6a74ee00a93984cf208a21f51c/46435938074.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/rexomaguvot.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/61481650569.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/35294019542.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf30e3915---68016121445.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d4736b11520e4ddc89155cafc2dbbb59/begumaxaranexagutup.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e819ee2595f---25989386215.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/45195381705.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fepudopexemenet.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pedipewimedovurunas.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/34904072469.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-27/20210727231022639652.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e08ea6b6---98439985373.pdfIn PDF document text
    • https://istanajp2.com/contents//files/65320983252.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/56828714888.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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 10648 bytes
SHA-256: d3833cdbe3a594ce4d89d6a0d10f62a5ef6eadade52547e0df657d6f8dbbbf84
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 17388 bytes
SHA-256: ffc3a95224b6ffe0d5dff1974b49a03eaad5768d057ac1c0c958d43f53b73fdb

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