PDF malware analysis — malicious · cf8c0af6a50f9e57

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 08:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 05373fa4a9cf0b251e38e85b4e61cd72 SHA-1: 64f67fc9fb5fe1fccbf1a96dce5443ed104edfc4 SHA-256: cf8c0af6a50f9e57294e25ce98918b330d73125473e29b656029077b36f64c09

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it's designed to redirect users to malicious content, likely to steal credentials or deliver further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=fundamentals+of+engineering+electromagnetics+cheng+pdf PDF link annotation
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l9ek7lbaohkodcsffgmbpvbk05/30733194927.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/vogur.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316639edbda---vonikisulokenevelap.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7e310438---vefulenu.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc64d67188d---62514042986.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ffnc1og1r96vq9q1mkefivico9/87499339357.pdfIn PDF document text
- https://aaaxxion.info/images/file/97320896087.pdfIn PDF document text
- http://ip-golubev.ru/ckfinder/userfiles/files/99091343261.pdfIn PDF document text
- http://songiadabinhphuoc.com/upload/ck/files/wibonoxevifenotimo.pdfIn PDF document text
- https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/gumuxituwig.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/df645a501d236330268dddb9aae7e963/rolinoxanefigewadikobisa.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6c5148901e3333f5a2d9e559f9e623f8/77099050482.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fcff61d78b---84950155154.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ede54a1c7393ef99756894d9d62aef4e/suxebujomiziwabugu.pdfIn PDF document text
- http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/1723855927.pdfIn PDF document text
- http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pujofokatedopafakuj.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff4f77b70---5387541094.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d85ebc2e---didevovirexojesutobixoz.pdfIn PDF document text
- http://iphysiology.ru/upload/kegobigu.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cac165805c3---xalabawabilikesukopeleno.pdfIn PDF document text
- https://2-view.org/home/view/public_html/ckfinder/userfiles/files/62546844266.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/72f387053aee9f6f960b6564cacc6147/1069150156.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f449b01b---44215202035.pdfIn PDF document text
- http://axwelindia.com/uploads/zosowekoxesabupebogu.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_off0000e298.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE298	17528 bytes
SHA-256: `c1b88ff4eda756157e33e200b46273da0814b2663429c7d7a5c86b2e37bd44d5`
`font_01_sfnt_off00010fe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000127fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127FD	11144 bytes
SHA-256: `b33771c4907f89c30b53f628d7371aecd33da62f0e1b077e599933a79b1d4ec4`

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