PDF malware analysis — malicious · 4e7ef71041a0fbc4

MALICIOUS

PDF

83.4 KB Created: 2021-06-30 01:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: c09970092bc214e4535e81f2d3ca0b8b SHA-1: 2433ad37d4340cb2446b0790514ac534eb6c2048 SHA-256: 4e7ef71041a0fbc43c0997115859aa364fed215be7559463e8e6052be6c68c33

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm heuristics strongly suggest it's part of a phishing campaign or malware distribution chain, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c170aed8ee9---5773679578.pdf In PDF document text
- http://tc-antey.ru/uploads/files/fomavalusobafe.pdfIn PDF document text
- http://lamelove-zakryti.cz/userfiles/file/27840677220.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pca1gedfh5tfc8ebcfpg2i51rr/37110357476.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/84471223020.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3da39a973db6969fbf828b5a590797ed/rezesufidifasez.pdfIn PDF document text
- https://finatwork.com/userfiles/file/bexaneberorule.pdfIn PDF document text
- http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/gupesekofepo.pdfIn PDF document text
- http://chatfieldfarms101.com/userimages/dutojitirosed.pdfIn PDF document text
- http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/ximikotejemawe.pdfIn PDF document text
- http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/84084061506.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7nd30v9ec9v67t1tknnp61p6vc/tijagones.pdfIn PDF document text
- http://email-database.info/userfiles/file/81154512524.pdfIn PDF document text
- http://www.buildingmalawi.com/images/uploaded/documents/vokaseravegar.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/71d603b1056337ac7d4ba63ba4f43ffd/25993332146.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210624075313776.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/sezokotujukuxulagax.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a26638ebcd9---siwusixemerelizefiparo.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e1096b85---gokadusosupuvobajet.pdfIn PDF document text
- https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/996e386912903db88d56614337909b2e/xibovanolilogugafevetef.pdfIn PDF document text
- https://argumentua.com/i/file/61450520433.pdfIn PDF document text
- http://csaladiegyteruautok.hu/userfiles/files/pokesidi.pdfIn PDF document text
- https://kltccompany.com/ckfinder/userfiles/files/surisazovix.pdfIn PDF document text
- http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/4951750095.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=healthy+co2+levels+in+bloodPDF 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_off0000e423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE423	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC35	16636 bytes
SHA-256: `839f9a7184b4146b22354e5e099eaa60210acbaec0a128ba754526084e0e0b0a`
`font_02_sfnt_off0001278b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1278B	10800 bytes
SHA-256: `61579f04d822e0e1ab905d42433638b45e1673279a6718060aefc1f4ca1dc0b1`

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