PDF malware analysis — malicious · 63d328d639998383

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 18:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 44c6fffce27b551afbdde71b4d2b6680 SHA-1: 3a88f0fe2343072c52050a92a3fc19665c44907a SHA-256: 63d328d639998383f3580a7f2d97ed896afd03e5fe64847aa6efbfbc65b66031

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve as redirects for phishing or to download further malicious payloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607348735ca17---84689681902.pdf In PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93604d68ba---46718919907.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1d6bd45e---joxiravonemerejumes.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7e0usbep67fhcrrkoenkp6htb3/mexil.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bee7081dd---walogimarewurona.pdfIn PDF document text
- http://stellarp.com/userfiles/files/22176144513.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/58bde10971206cc9b5e86dd8cfb52230/80106867297.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/73619238481.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ef74dccc8a7e5d78258b87465004c87c/26510141841.pdfIn PDF document text
- http://daisytalavera.com/userfiles/files/63074302884.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/xaturefokukofufemiwo.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/rifutuwad.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e30f328214070bc2680be283c47907bc/mibumul.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/730b36d554eaa90dff1af497c434a0d2/dofixabebiselepow.pdfIn PDF document text
- https://zahnersatz.pl/userfiles/files/fosawukizefavomiru.pdfIn PDF document text
- http://jagodkaprzedszkole.pl/userfiles/file/33418863390.pdfIn PDF document text
- http://sportingclubalbinia.eu/userfiles/files/gufadole.pdfIn PDF document text
- http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/watamigatoxuzukitike.pdfIn PDF document text
- http://reversetheclocknow.com/ckfinder/userfiles/files/76519249608.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/833e556ed2150d5a1a0bc9fd9d5d4a57/98217346401.pdfIn PDF document text
- http://dzbnf.com/upload/file///jibabo.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/kalezizozuzepijopaparet.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb204c21d4---12246677448.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/11672628965.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2c94324886f3a0e01bb4880504ea47a1/75046030539.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=behavioral+humanistic+and+cognitive+approachesPDF link annotation
- 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_off0000f6eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6EB	17288 bytes
SHA-256: `24610fe02609cd3ba340cd8910c3dcab7bdb945ec03f598de1086559b8ca68b8`
`font_01_sfnt_off0001240e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1240E	11180 bytes
SHA-256: `5ad9d19c9eb8ad482a250917599f352414c0afa93c77133b49159d65d870bc36`
`font_02_sfnt_off00013de2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DE2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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