PDF malware analysis — malicious · b351f89ccbc8bbcc

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 10:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3663a1069f3eb931217fbbf6e13d8035 SHA-1: 9989608f522aec18bc5ec6315f83d228301b052d SHA-256: b351f89ccbc8bbcc197754bd93d95512f8b946caa17091f42f36c80cbbcf2055

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document has been flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a deliberate attempt to use these links for malicious purposes, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection suggest it functions as a downloader or redirector to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://nomylo.ru/uplcv?utm_term=bandwidth+ruler+free PDF link annotation
- https://tidurmalam2.com/contents/files/5617545638.pdfIn PDF document text
- https://dolaodong.com/userfiles/file/8385611236.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j7puqn6st5mi2flklahfra8var/57403299779.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/727184033a1d005e96b11a856f96d64a/kawigedirusabupepifav.pdfIn PDF document text
- https://sabunwangi.com/contents/files/noxuwukemusareno.pdfIn PDF document text
- https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/poxukemedu.pdfIn PDF document text
- https://yunglin.com/uploadpic/files/wobunu.pdfIn PDF document text
- http://studiorestagno.eu/userfiles/files/zawasapamofomakamewuzo.pdfIn PDF document text
- http://top-caster.com/userfiles/file/putedurizekomaxidujilu.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e87dc699d6f6fbfb29b043c997e7aad6/89163839821.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/gutafirosekaburodoso.pdfIn PDF document text
- http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/20835558666.pdfIn PDF document text
- http://ippon.lv/uploads/File/takowasogugufisuveja.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6185d1ff539b2c25d52297c80ddf85c7/99312604946.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/97003229236.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/96069746004.pdfIn PDF document text
- http://atol-res.pl/uploads/file/miwixarubafuz.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf87b8cbe---fazavewewenawi.pdfIn PDF document text
- https://shatalarab-llc.net/userfiles/files/diketafolor.pdfIn PDF document text
- http://hebammenglueck.de/ckfinder/userfiles/files/15316396990.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881c03be9c---gerasujozubowosajuxovad.pdfIn PDF document text
- http://congchungnguyenlieu.vnpec.xyz/uploads/files/22550023033.pdfIn PDF document text
- http://techcessgroups.com/userfiles/file/1668779016.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/wafokoxazixuxadepezelumen.pdfIn PDF document text
- http://bm-shower.com/userfiles/files/80921940762.pdfIn PDF document text
- http://kamkmori.cz/ckfinder/userfiles/files/jakopatelebu.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_off0000ec5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC5B	18404 bytes
SHA-256: `b7f2274e5a00def85f1f53b511a47fa8d5f7644bbcba7c1802a30aa1ead90943`
`font_01_sfnt_off00011c95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C95	10400 bytes
SHA-256: `4fa4585a92fd42e93075e2b6d2434cb5b00fb1502cb23b017dd77cac95201aec`
`font_02_sfnt_off00013418.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13418	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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