PDF malware analysis — malicious · 1a528a281a6baba5

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 10:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 48f703a0746d4a51a6c70af3c071dca4 SHA-1: 954d61729bdd9ba3005026b9830be9f40d1b1c39 SHA-256: 1a528a281a6baba557c134852594da1b5c370c3fd4b53516bfc8dd4d1cb1d589

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=does+stella+believe+blanche PDF link annotation
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b0138ca2f4d---sowulibogegoxasakan.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/ganugamaganisogisom.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074034030072---pimijozajewepebuni.pdfIn PDF document text
- http://babywagen24.de/userfiles/file/58769608465.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/kulizakogegujev.pdfIn PDF document text
- http://fxmeat.com/upload/file/b578acc52d7a48ba88f0355d96f53618.pdfIn PDF document text
- http://schnauzermountainminiatures.com/clients/17729/File/94446570552.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/16871964154.pdfIn PDF document text
- https://tiemhoamo.com/data/dulieu/files/73159074850.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/acca4821aeac0f8f0d329d6fa55498ba/5426385337.pdfIn PDF document text
- https://digireg.ru/upload/20835067224.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0l4sh9nadk01jkkpbudc83ioqg/48807338173.pdfIn PDF document text
- http://learningkey.org/userfiles/lukoziwobikedogugumi.pdfIn PDF document text
- http://iwishop.hu/file/5366562640.pdfIn PDF document text
- http://www.tramag.pl/upload/file/74164554342.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rmhcdavute1litqq37335otnv2/bomupufotoworigo.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9gpknfojf8kqigqikvugmhruhv/tupetozoxuwuzevofusivim.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/58453378b2952d5a5f380cf2cd0577b7/bezaboloku.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a21e4d2811539ce2d2553086be79bf48/35260822060.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f928d7604a---rasadol.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/025bce5cbd6b6c9c08ca338c28ff186b/91946469507.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed82664b33---80372533190.pdfIn PDF document text
- http://domplus.su/userfiles/files/pajaralivazazozojepuj.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f575c148a42dd208044e22be3a033214/62701180461.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_off0000ff7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF7D	10432 bytes
SHA-256: `e40656878db08b056b10af17e96dd38453786a45daa6b454f05593550546ea0d`
`font_01_sfnt_off00011722.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11722	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F34	17048 bytes
SHA-256: `f47606a9c590cbe367a3bf1bd66ead6214d6ca1cfe2086cec90e34c668efa24e`

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