Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bcd15f1dc43ddf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 14:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65aa2f3d1427eec4801e8f102b67ab7a SHA-1: fb94276eb3c0e9c6501a0a9cd983a3994fc5fae6 SHA-256: 53bcd15f1dc43ddf59db32975ed3bd8ed94cc1ac7ebac7ca6ea1986668b9d754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

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://drafthe.ru/uplcv?utm_term=here+i+am+lord+pdf+piano
    • http://abwnickersonplaza.com/uploads/files/sipamalitixisojexazifosob.pdf
    • https://highlander-inn.com/assets/userfiles/files/disisamurujejizumuzoni.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/figowebisinopeminax.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613892b514704---solekasinevepiloxogako.pdf
    • https://maconlux.lu/userfiles/files/vomesivapolofa.pdf
    • http://vibrobeton.by/pics/files/vakidijabejupabuleluwe.pdf
    • http://maroba-zirndorf.de/file/repowijiwinipaxeluwivitix.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jri5k5cveeuidt0smnm09o37o3/japogef.pdf
    • http://inggeo.eu/userfiles/files/16447811794.pdf
    • http://hacoauto.vn/upload/files/jonazarirurawerofexuki.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/44392373472.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80789837380.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdf
    • http://secondhandgraphics.com/usrfiles/file/tegugekuroju.pdf
    • http://rqconsultores.com/userfiles/file/71679846574.pdf
    • http://2m-m.eu/userfiles/files/71734781879.pdf
    • http://bfcy88.com/uploads/files/22518152034.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddf3c06f---lasatevada.pdf
    • https://sklepbonus.pl/userfiles/file/jobesufa.pdf
    • https://afgventuregroup.com/cfiles/file/tedetabopewumilosizup.pdf
    • http://jevades.com/aircraft/fckimages/file/kepagevukuzifunumijowedas.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7c3a1d1e---bakipopoguzozuko.pdf
    • http://dkstores.gr/userfiles/file/newiropiwipijazuvaso.pdf
    • http://alwaysshine.com/fileimage/file/janisilete.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16792 bytes
font_01_sfnt_off0000f3e7.bin
eab9a49e18f20d337109dbb0dd18a882af984abb41d75e46bcf93cd21a52a9d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 18224 bytes
font_02_sfnt_off0001246a.bin
3d4a6d7fb899417f28bc2e0d91b9d74d9b452e42cc5a6de89761a948f8305d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 10384 bytes

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