PDF malware analysis — malicious · 57501aa42757ba2a

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 08:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4074f8311f21f563134d423d60f8e1bd SHA-1: a10c9c2d5575926922e16442cd9388f8c1277ef9 SHA-256: 57501aa42757ba2a576c5a6d9ed196e52b6e615ef056f36d87ed76cf9fc1ce30

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=cybex+pallas+2+fix+manual+instrucciones PDF link annotation
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/27367fd79104bdd39e1b450703184338/49710932440.pdfIn PDF document text
- http://cukierniabrzezinski.pl/www/artizam/fck/file/24137291812.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3c5b42bd613330d9ec5b2dc09110fee5/22921458354.pdfIn PDF document text
- https://fulzugaskozpont.hu/files/tibomojapujebud.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d72f5feba5295415ba41150794837eb2/17265418468.pdfIn PDF document text
- http://lblussana.it/images/file/fadixijerozaperamu.pdfIn PDF document text
- http://synowka.pl/galeria/file/gififavajulis.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/70522514962.pdfIn PDF document text
- http://zenithmetals.com/files/debat.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab4b63645de6699b5b51ca7486279f8a/nugufunasadam.pdfIn PDF document text
- https://eccdc.org/application/webroot/userfiles/file/rutuwis.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/jigod.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/tofakoxotigurunidukibege.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceb2e5c78---35418060687.pdfIn PDF document text
- http://aumnat2car.com/ckfinder/core/connector/php/upload/files/45233621295.pdfIn PDF document text
- http://xn--2-140-swe8h.xn--p1ai/files/kemudupamasaderabiwur.pdfIn PDF document text
- http://hz-kontejnery.cz/ckfinder/userfiles/files/70790634193.pdfIn PDF document text
- http://csc0451.com/userfiles/file/20210802080008_8ddak0.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/56987765748.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda37e65f7f---77931118345.pdfIn PDF document text
- http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zirigiraperowa.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0eb7155e9---togexoge.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/suxit.pdfIn PDF document text
- https://tectrongim.com/uploads/files/38944475640.pdfIn PDF document text
- https://serviceservice.eu/userfiles/file/71358282623.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6ci09fibf2klak9vm2ak0j3j8i/xaviratogaletulubirot.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_off0000daa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA3	19468 bytes
SHA-256: `0d886674926668ecc798e8284655b9304afbba2f84e1d573ce4b8f8e0f2b06bc`
`font_01_sfnt_off00010d02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D02	11248 bytes
SHA-256: `4e923ef4347b4bf0be5e9b30441e0cafbbc2fb14b5bc788b58e29f76e9028c3b`
`font_02_sfnt_off00012748.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12748	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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