PDF malware analysis — malicious · c9cd7ee027b8a258

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 12:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 6d3db170dbd28e2a784e4c928ab75de3 SHA-1: c082db92802497039806c77a4330120086f5739d SHA-256: c9cd7ee027b8a258e1f51f5619ea0f618454412c4331df27da7c2e3e1fa81a02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures to redirect users to phishing pages or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://oniceh.ru/uplcv?utm_term=king+of+queens+educating+doug PDF link annotation
- https://efnnma.org/files/file/66029169489.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609083b133932---57661867379.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/setikotoburepu.pdfIn PDF document text
- https://call-life.com/ckfinder/userfiles/files/92949038400.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e184737f1---18475696158.pdfIn PDF document text
- http://alacarte-design.de/userfiles/file/fupunafiduden.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1f086dbb---51708752642.pdfIn PDF document text
- http://hnspkjx.com/d/files/xoxazedosutarimogaxuter.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/rejewaxerolek.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c856dbce---wabin.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f1771138---wobelirunukabome.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/5qh3j6evjcj6l53mam9pjotfa4/73352453914.pdfIn PDF document text
- https://acryl-bg.com/userfiles/file/buzawidi.pdfIn PDF document text
- https://comiconfezioni.it/file/74445844842.pdfIn PDF document text
- http://chandigarhdatarecovery.com/files/file/jufedokudemeduraw.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160895ddc905fc---febokuzurologamimeje.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hued3ddi4635enhshcrqkgqeh4/6930800179.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/powikub.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a9796de39ab36b534faee57f0d721472/2448414451.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/94518144469.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c464e5541a7cdf10281f7f3cbf83fefa/wozorowikisefu.pdfIn PDF document text
- http://wtmongolia.com/materials/file/fazuzotofo.pdfIn PDF document text
- https://progin.swiss/ckfinder/userfiles/files/puwus.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087c105d5814---1917538530.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vhmu4knredgiejfhg5h569fa8i/rufubedenali.pdfIn PDF document text
- http://cybernet.asia/UserFiles/File/gelowudojotase.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f9c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C5	18008 bytes
SHA-256: `6c66bab0f552b7c425ff41360d1000c80b6eb7aafc7710ec1d336138fd83601b`
`font_01_sfnt_off0001286a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1286A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014081.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14081	10744 bytes
SHA-256: `9ab07842d0ddbc042ba889d4d54280aa5c09c590c5d7d1afe22b65672cf3fdd9`

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