Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b33688302812716…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 08:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ae924fc781e650293a62fb759e96631 SHA-1: ed927abe74149eea3018ab67830be2673f61d1ee SHA-256: 4b33688302812716cf7bb1bc80decd4905c87af0bbf7ccebdf5b3bd79f9fabb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign or a distribution point for further malware. The presence of multiple distinct hosts and link farms indicates a broad attempt to host malicious content.

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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160889ea027377---51050425616.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c937493c215---77777763751.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/bikosimapidajowos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80165494b9---38201102959.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c83d5904571921c789a384a79babbe8f/dukilagewomi.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2810b50386---57720501890.pdf
    • https://svetplus.com/userfiles/files/11593925293.pdf
    • http://straub-online.ch/userfiles/files/77831618804.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f21155ce---21609989487.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3534f735e85d19b4140bf97e429b6d44/92272355014.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/rikalugezel.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/27801950228.pdf
    • http://andlupa.com/userfiles/file/18835359258.pdf
    • http://macautemple.com/userfiles/file/72871839342.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/95b5188c7b834c21c8eb9b7cf4050da8/resosevegebotodosedivu.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/baxexezemowepipetofizo.pdf
    • http://sskj.pl/userfiles/file/sofalidigiripitanis.pdf
    • https://liniagdanskzydowo.pl/files/50000617469.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/88493737916.pdf
    • http://redactron.com/userfiles/file/rifoji.pdf
    • http://babamoleskine.com/files/file/90285865539.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160811435138f7---65668687719.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11184e975---92204758748.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1f5493246029faeb7d84126c144c3228/zisawivafutakosi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d86f3b0c5---dufoludekalisaju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ingilizce+t%C3%BCrk%C3%A7e+s%C3%B6zl%C3%BCk+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_off0000e014.bin
1897cda62e6d74468b587a5d0b79f42aa2188c2ad10c3d58e367114e4e8b3b07
pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 11220 bytes
font_01_sfnt_off0000f9b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
font_02_sfnt_off000111cb.bin
17c5e329cf8bae98c7d78c38bf3696840220193e9fb594b7ff66bdca4d17f8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 18052 bytes