PDF malware analysis — malicious · cbd19f64e73c8f40

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 16:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 28d0845b7d48a54b0aa7d12181b00f3f SHA-1: 10205e8d3fbf2ecb825b22098c2590ff8283f8e7 SHA-256: cbd19f64e73c8f40868657d905b19157a88bbc0be59cf14d21be45701e6511ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those pointing to compromised WordPress sites and disposable hosting, suggest a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=adding+doubles+plus+one+worksheet PDF link annotation
- https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608967a3d4e03---74143839410.pdfIn PDF document text
- http://autoscuolapezzano.it/userfiles/files/zudeb.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/nimege.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c104d967d---sunulijumoxere.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/msla4nf9uc03jvu1tthkecadda/waviworatogolejupezaduz.pdfIn PDF document text
- http://inter-travel.hu/_user/file/64206049363.pdfIn PDF document text
- http://harmonie-avion.fr/actualite/files/90653334983.pdfIn PDF document text
- http://giftboxvietthuy.com/upload/ck/files/lelojopilegibajekezegemev.pdfIn PDF document text
- http://winso.tw/userfiles/file/82416595663.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5fce1d0546dfcdf2d8d165e0a9315fc6/71299676196.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a089dd93905---43733468436.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/88925715849.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/33317454454.pdfIn PDF document text
- https://jf-orvalho.pt/userfiles/file/958174578.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf7df4910e---62876917724.pdfIn PDF document text
- http://madiagranitosilano.it/userfiles/files/23882320493.pdfIn PDF document text
- https://tdfstore.it/file/narajalilurani.pdfIn PDF document text
- http://afro-safari.com/upload/files/50177631055.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8a7ee52d933d2f11d770cf30e305e3bf/96537452335.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/17274087695.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1267f0bca3---munudedax.pdfIn PDF document text
- http://sallytour.com/FileData/ckfinder/files/20210718_7FE8CDACC9D1B826.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/5862225911.pdfIn PDF document text
- http://cpils.com/userfiles/file/pobitijiwejolemibasiwimaj.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_off0000cf23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF23	17364 bytes
SHA-256: `8d042d9df59c908ee17b47e9e4f3f2897647da21afecc670967c78458fcc52c7`
`font_01_sfnt_off0000fb64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB64	10908 bytes
SHA-256: `81d7df79f876609eb36fe6f8648590424b8d83f43b06167695c248b5fd1a5c7d`
`font_02_sfnt_off00011436.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11436	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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