Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b5f78a0132f9a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 15:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 659c5dcc49c2c80950c2144e77a3a2c4 SHA-1: 8be2de24f2cb6d300479ab4bf7254eb295016147 SHA-256: 898b5f78a0132f9a2b0b34daf9297aa35b968bcffca7191c35e7f0a614635b8e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads and potentially lead to phishing or further malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports its role in a malicious linking scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c739a03d0a493e9fafc83efb10069e05/79842345828.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/61799510624.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066342880---39746982714.pdf
    • http://patronusalapitvany.hu/public_html/upload/sugugesijaruvapum.pdf
    • https://triyoga-tv.ru/userfiles/file/kesimaku.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/45372247097.pdf
    • http://ets-sptk.ru/pic/file/walebosazapigotenobud.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/26406612815.pdf
    • https://yocarbroker.com/upload/ckfinder/files/4692019816.pdf
    • http://abwrichmond.com/uploads/files/64724570656.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614564e88874a---48181026154.pdf
    • http://thaide.org/userfiles/file/tutidepivigivare.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ntedpjku0ijhjfrgdr1nq23q30/xiwibiguz.pdf
    • https://j26clean.com/upload/files/76021469721.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/godezipezupefimuwobubed.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130519577ddf---kaniwimutiz.pdf
    • http://tomaszfilipczak.pl/userfiles/file/34230944462.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kukopatekane.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda299b103---7027472504.pdf
    • https://beldapromosyon.com/calisma2/files/uploads/mebibe.pdf
    • http://constantemail.com/userfiles/file/1631282731nanovejemixo.pdf
    • https://cancelaria.pl/galeria/file/xebebazitam.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/savujutisiwowusipa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hack+someone%27s+icloud
    • 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_off0000d654.bin
768677531b23a07ed20c3a295ef9acc48846d511823e7287dc96b20e6dffee91
pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10836 bytes
font_01_sfnt_off0000ef38.bin
129aabf8c582be2756ef733127dd1f2346365490bd9428ae0e580ccea34f3f73
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 17008 bytes
font_02_sfnt_off00011ab4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 16792 bytes