PDF malware analysis — malicious · fa5acb4f91793a23

MALICIOUS

PDF

81.2 KB Created: 2021-08-01 06:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b25604df820846b8d3d8951375111e04 SHA-1: 78066839098ef28c802215f75d23042dda6b2c01 SHA-256: fa5acb4f91793a238196188bb55b1522e6ca25d6c82ec56371d66e6f9ad394cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://coretry.ru/uplcv?utm_term=supercheap+oxley+opening+hours PDF link annotation
- http://firegallery.ru/img/upload/pijeziz.pdfIn PDF document text
- http://classicalgardenstatues.com/uplds/file/datibefuze.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c09fa0028e6ff2635a354878c00ed13/69372843979.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69aabcea5---kosisof.pdfIn PDF document text
- http://bangkoksolarpower.com/syner_upload/images/files/narenelubuxidedesekiw.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0obfc20aoeehbauad01unug2m6/xazimatipewak.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bc15fa351c2cb905efcda49b7ae84d58/lopimogobipibalomi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45c9eae67---9645305827.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7c159e7d45e2bf8db0384ba05d531141/7008967244.pdfIn PDF document text
- http://hakkabrothers.com/userfiles/file///jugodul.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2773260a---18341280356.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/xebamefikabipume.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/46113179728.pdfIn PDF document text
- http://brukbet.com/user_images/file/90642908196.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/govorawotefebopapewafe.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e936c390810---3500558607.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0op0viacmm30k302hupn4vosp5/52498333820.pdfIn PDF document text
- http://analogsys.com/uploaded/file/553477567608a95696b6e1.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12874c0b1---gimuteguvif.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j7evlo68j9sermr36nr6svcd4g/39891341258.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/jikozuruxufivigadaxipep.pdfIn PDF document text
- http://au-zlato.sk/upload/files/rokulevasavowesina.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8q8eq1j6581849a55sg6o1inj7/tudidozozuwuzu.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/37100a9e64e0e679c49239033f96d86e/90984830607.pdfIn PDF document text
- https://inverpalmas.com/aym_image/files/kideb.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_off0000d52c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD52C	17956 bytes
SHA-256: `9d42635c4e0147f00d112ea1ae31d76f3d4c988e14fc4916cc2c1a068f0f2305`
`font_01_sfnt_off000104ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104AC	10948 bytes
SHA-256: `4e6b05cdf681940f93fa50b8cd1aa9661399f2b28aebf99a9c4527a91354995f`
`font_02_sfnt_off00011dfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DFA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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