PDF malware analysis — malicious · 0ecb7da81d885e32

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 03:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d51bd68f7b33a46918034bb3d8bfe695 SHA-1: ebbd4c33c7ac4a9e37f02e5a3e6c4c9b9b9655fe SHA-256: 0ecb7da81d885e32c141097bd21d13e00f8bdbeb4619fa4a9179a802226a8397

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware distribution attempt. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and numerous URLs point towards an attempt to exploit users through deceptive links, likely for initial access via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=optocoupler+working+pdf PDF link annotation
- http://udokutscher.de/gfx/userfiles/files/xazubedurefufel.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cda68a0f278aa4ebfe5b96935bc11451/94416530830.pdfIn PDF document text
- http://lorofilmes.com/Uploads/ckfinder/userfiles/files/susunemonofusupon.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ceffc89b7bb---1684024110.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609be65114a80---89149846810.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/josadetexe.pdfIn PDF document text
- http://forglory.cz/ckfinder/userfiles/files/dumakexeref.pdfIn PDF document text
- https://tidurmalam.com/contents//files/wasidevufidivokaf.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbdca672e---11771462348.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vuslkscalk8tqjccg7uqg1emlc/2938659057.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b43639686967736de03c365aba29e1bb/83332659271.pdfIn PDF document text
- http://urbancollab.com/userfiles/Proj_Name//files/68751702302.pdfIn PDF document text
- http://helder-effect.nl/userfiles/file/30461237196.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d06fdeb2b41eca6db5fa501b04a9c29b/52366404376.pdfIn PDF document text
- https://clubslotalmatriche.com/calcas/file/27041319120.pdfIn PDF document text
- https://argentinaproduct.com/ckfinder/userfiles/files/fulibetofozeneve.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/170a41d6f6217ac989e9fc00b9f8f038/sivufusizi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784172bbcee---xavegilixuka.pdfIn PDF document text
- http://gfb.it/upload/fck/file/79527331302.pdfIn PDF document text
- http://thanhlapcongtykiengiang.com/upload/ck/files/9350790071.pdfIn PDF document text
- https://brazilairporttransfers.com/ckfinder/userfiles/files/gorakivudubidozitij.pdfIn PDF document text
- http://schokozentrale.de/idata/63497057100.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1de311d83ffe61315fea0227dc32de92/refefikiweroxif.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_off0000e455.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE455	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC6C	10768 bytes
SHA-256: `ce90834ebfc7e5b67dbf7805d9bc1c5ba2f8f7bf6f5a520272f09a93ed1dc16d`
`font_02_sfnt_off0001152a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1152A	17124 bytes
SHA-256: `c8321abd93ee06eedd57727dfd566d01873d64e6f38c20a3afefd2d644db3da2`

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