PDF malware analysis — malicious · 7253add462678451

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 03:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 073462a7f761b6f4a0a9d249251961f0 SHA-1: 64a2c9c6dfea0fc314c41ead4c94f87508b5e3fa SHA-256: 7253add462678451d5af79ac7cf97257d8d9cc0a1ada46d5d0986af586ce868e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm rather than containing readable content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://poiskvod.ru/images/file/fujurupobep.pdf In PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48ea1e14---61746490963.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2dde62b695ec633a81f016a19ba558c6/9425102234.pdfIn PDF document text
- http://xn--szabowski-tub.pl/userfiles/file/69672283272.pdfIn PDF document text
- https://divanich96.ru/admin/ckfinder/userfiles/files/mazazuzoka.pdfIn PDF document text
- http://soleilboo.com/images/uploads/files/tivebenusimexarexa.pdfIn PDF document text
- http://dharmapremipariwar.org/userfiles/file/xekulupesezokup.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89483205d7---gemexumememaduriboxomoka.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d289b8a1e34---25445560094.pdfIn PDF document text
- http://ghettaetamionarchitetti.it/userfiles/files/31902665627.pdfIn PDF document text
- http://tafgambiatours.com/userfiles/file/nofimirifogotiloxodixaz.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a13b319ede118b2ac824dbfaaa2f51b2/zevasudasonalikiru.pdfIn PDF document text
- https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/igcd2279pgvemmm3oqr0t9j3uf/bofixinozejozawub.pdfIn PDF document text
- https://cgeminfos.ma/upload/file/13064564008.pdfIn PDF document text
- https://hopadive.cz/ckfinder/userfiles/files/dejikozozutizulerud.pdfIn PDF document text
- http://krevue.cz/UserFiles/File/luwer.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/57645096063.pdfIn PDF document text
- http://altinay-law.com/images/file/70758201064.pdfIn PDF document text
- https://pfhotel.gr/ckfinder/userfiles/files/geposin.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a380faba064---62057147090.pdfIn PDF document text
- https://stbenedikt.ch/userfiles/files/wenukumapuka.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed0bce614---40747147370.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/25ff1ae749a33505cc6c02b7583686c5/18889646076.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8691e454dc26f039167a20e5480e2f15/99352702534.pdfIn PDF document text
- https://palcev.ru/userfiles/file/kazugosuvikidusawopesuda.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=personification+worksheet+year+3PDF 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_off0000d352.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD352	10852 bytes
SHA-256: `fb492653ad18b6e42f46489a8b3bb22a1cff50c311590218b89ff0b8e9ff294a`
`font_01_sfnt_off0000ec86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010498.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10498	17276 bytes
SHA-256: `621f08f90c3594c1fec29718e1f0fb36e0e6954c442ac9c4ff9be8a979949943`

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