PDF malware analysis — malicious · 79b061df06562b04

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 08:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 86aceaf70cea0b27effcb7a696a1c2fa SHA-1: 2238608a41bf65becd6c2366eeb5596f3bb27f28 SHA-256: 79b061df06562b0464f66ecceeb91a3c71ef2b8884c0b9d7f62f7f87ca1631c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

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://oniceh.ru/uplcv?utm_term=loomis+three+dimensional+drawing+pdf PDF link annotation
- http://donateagift.eu/userfiles/file/dusemokadefanifudomatox.pdfIn PDF document text
- https://callalilyvn.com/upload/files/munuponuvokajatewirezepev.pdfIn PDF document text
- http://www.celso.org/download/beweninuwozurutufiva.pdfIn PDF document text
- http://mamam.by/upload/File/file/silekizanumorapi.pdfIn PDF document text
- http://woori-tour.kr/FileData/ckfinder/files/20210815_94FCE1C30ABE572E.pdfIn PDF document text
- http://placc.info/up_image/sosikuxababuvovuwabix.pdfIn PDF document text
- http://chinasoftcore.com/userfiles/file///zudunoladajuw.pdfIn PDF document text
- http://shopexpert.com/app/webroot/files/userfiles/files/dobadapujaduxotepus.pdfIn PDF document text
- http://xetaihyundai.net/upload/files/siwexadotopujumel.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/dikegopamazewumifogifek.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8e15769df6a0f55fa04f90ee618e081b/81105501302.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/6543492666.pdfIn PDF document text
- http://akademibt.com/resimler/files/zedidexixexelubijajej.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6aaadae0a---76186061397.pdfIn PDF document text
- https://porterbrothersltd.com/app/webroot/uploads/gawobinedof.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8ac924372747d49c33ca139b54a89284/wiwazizovevuxesitasubilu.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc66d184e0---48541299136.pdfIn PDF document text
- http://debeleven.net/UserFiles/File/48423621331.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13449df3c---16400427280.pdfIn PDF document text
- https://mintedimages.com/ckfinder/userfiles/files/motazavewidivoted.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fkq613lq406dav78u2h4usoqbo/rewavebomagapegire.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160def6d6d194c---94317832520.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/palagu.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161123c6881b3e---burujimigenalilawunas.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_off0000e3ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3CE	10988 bytes
SHA-256: `ce21a045687bc54c15257b67eb6822a6f1ffdf86e190438625122d18ebd27cc6`
`font_01_sfnt_off0000fcf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF0	17816 bytes
SHA-256: `e17c0db420a88835eb9491e60f41541a29ef074df7bf37258a6b9d5893ae4bdf`
`font_02_sfnt_off00012b85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B85	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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