PDF malware analysis — malicious · bf57b177c7ff8a42

MALICIOUS

PDF

82.9 KB Created: 2021-08-21 06:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: d065b039430591e30105d5312e064de1 SHA-1: 5c399e02f94a48b5deecbd281b7a6265be5a2504 SHA-256: bf57b177c7ff8a42148943b485f447d09e5472194adbe82c54ced3a315089caf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malicious content or leading users to phishing sites. No scripts were extracted, but the extensive link farm points to a spearphishing attachment vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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://crewmak.ru/uplcv?utm_term=headcount+forecast+excel+template PDF link annotation
- http://sisparts.pl/zdjecia/fck/file/46973293537.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bd3bf2d8e12fd66913afc60bcaedd442/fubijokofodidujokogixi.pdfIn PDF document text
- http://antonioruizabogados.es/userfiles/file/30585641795.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d36dd237e6625f1bab50afb7b01639de/39845580318.pdfIn PDF document text
- http://sushrutproctology.org/ckfinder/userfiles/files/37592372019.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/39082867530.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//6601032627.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8966e4460f---62426451281.pdfIn PDF document text
- https://tectrongim.com/uploads/files/66520492066.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba72a341bf---javemozom.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mgkavm4atokeh1kpguemhdehj0/41678419801.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9d05eade7ce48a9b00d3040277205f3f/28778056517.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf8400a13---3222349476.pdfIn PDF document text
- http://www.mustwalge.ee/data/content/files/kowepofor.pdfIn PDF document text
- http://stagelight.pl/userfiles/files/43861130797.pdfIn PDF document text
- http://hotelbasantresidency.com/uploads/91902510710.pdfIn PDF document text
- http://chalappuram.com/userfiles/file/fuwedaxoxeroja.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d38f02fbd---duzezuzug.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/janaxekedafemave.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078287e4b15b---1446171046.pdfIn PDF document text
- http://creativetechno.in/userfiles/file/wexojegagukazob.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/u2n5h1f8h84tvcep5sdr79qhu7/94109406744.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33f08609a---55396664396.pdfIn PDF document text
- http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/1kt5d1nm8nrvrf19rmhn1ve60r83b6sq/59777751445.pdfIn PDF document text
- http://beachhigh65.com/clients/879402/File/radubisorani.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081e019267e9---fumoga.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_off0000def7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF7	17356 bytes
SHA-256: `b1d0017f4d8eed2f6b673d766972d33edea9122a842f4a9026e4fe888370b046`
`font_01_sfnt_off00010c20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C20	10884 bytes
SHA-256: `037cad78c40bd3001398d625a138cc228d8513bdf4785e73dc84d01295a3f724`
`font_02_sfnt_off00012541.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12541	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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