PDF malware analysis — malicious · b6452d4256d944cb

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 21:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 1c4845f0af01583ce3f02c010fcb28b9 SHA-1: 489ac19dc605e08867e17fe336a01b65fbbc8fbe SHA-256: b6452d4256d944cbde8f21a72086dff2302afe3f15180535d422cd69f370d3fb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://smidgel.ru/uplcv?utm_term=ap+calculus+ab+review+pdf PDF link annotation
- http://vtaky.sk/media/file/xetiriberamape.pdfIn PDF document text
- http://fanti-fitness.pl/uploads/assets/file/57072254353.pdfIn PDF document text
- http://methese.com/upload/files/84703752638.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/14rb7j8ecalbnqbm8fagub78e5/bodaranitojilozepev.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df22677290---8743455919.pdfIn PDF document text
- http://stefani.cz/fck/file/disepexonorus.pdfIn PDF document text
- http://allasclub.com/campannas/file/pugijugu.pdfIn PDF document text
- http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dexozamexezifiv.pdfIn PDF document text
- http://actybrain-consult.com/Upload/files/ridogegipejixefifaxawugi.pdfIn PDF document text
- https://chongtham68.com/app/webroot/uploads/files/woxoxawativawelujefoba.pdfIn PDF document text
- http://kursadowicz.pl/Upload/file/23040466039.pdfIn PDF document text
- http://c2r-auto.com/uploadfiles/file/2021091519430273499.pdfIn PDF document text
- http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/42939717075.pdfIn PDF document text
- http://lube-stc.com/ckfinder/userfiles/files/11085035678.pdfIn PDF document text
- https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/97504309079.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/kajufudagulekonipoj.pdfIn PDF document text
- https://senegal4d.com/contents/files/2295525268.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145c66594aab---xozifunemurukebog.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_off0000c1f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1F7	19168 bytes
SHA-256: `0fa9fe5b813b964b0350e413729573504486e7441d95ddfe40fd6204b67070ee`
`font_01_sfnt_off0000f47e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF47E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C95	10664 bytes
SHA-256: `9dcc4917193aca727ca423d0e3fa309480b51e0091c83a40347c6275a514b06f`

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