PDF malware analysis — malicious · ac91ad116361e581

MALICIOUS

PDF

78.0 KB Created: 2021-08-18 11:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e3f3fb1e17e7648f9fe9e0a21635109e SHA-1: 25b278d6706915e81853d37588b175827f53bf8f SHA-256: ac91ad116361e581d9e50bfb630887548442e7b0852c4ff3ad27fed91971a1c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF structure itself does not contain executable content, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://spalovnachemolak.sk/userfiles/file/399361538.pdf In PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5j3ukgsjubvp7nbmgb1n534fra/bazilasiladat.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/33h3v07078qs148nkr4di8t8uf/pixafupub.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1g4pam548s49mijne6of1j82c7/vanulofolomesuroputuge.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7c1bb119f47f73e977bc1fc3e0b93642/kureraz.pdfIn PDF document text
- https://cortopolis.ar/userfiles/file/3582249766.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fcba00b30af---90013274761.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b23a79dcd68a9037ef40ea032d71c35/fuwutapuxa.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611689da7dfa7---ganesukejosixodukoxa.pdfIn PDF document text
- http://kibbkw.com/uploads/file/63559121964.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4bc405ea85356c908d5a4e60448459c2/rexeki.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/tozasotofekadesosug.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/32d58019f60afbb1fe44367461efe77f/54705861022.pdfIn PDF document text
- http://holidayinntorino.com/userfiles/files/47415720140.pdfIn PDF document text
- http://hotdeals24x7.com/ci/userfiles/files/88295713120.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100776a392c5---85234511197.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/nadexidupobotogod.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1c9bbbe0978b74839aa1374426dc38c7/fapidumage.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/338v81i2v3gpf9t5dadddh4ao2/gunedesazemapab.pdfIn PDF document text
- http://www.bluewhaleline.com/image/upload/File/99721608325.pdfIn PDF document text
- http://agriturismolescuderie.eu/userfiles/files/97094892229.pdfIn PDF document text
- https://betenrealestate.com/sites/default/files/file/81485027822.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b78a1d3fe---gepikif.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/codru8bnu3csno0sghbcqq0c3s/41686596570.pdfIn PDF document text
- http://maraulsan.com/ckfinder/userfiles/files/migalabo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=baixar+musica+aurelina+dourado+a+vitoria+chegou+playbackPDF 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_off0000c964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC964	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e176.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE176	17916 bytes
SHA-256: `f14844cc6a30a5892ada07cacec47c4e56d4d3fc1ee54f391ec8badba00a562f`
`font_02_sfnt_off00010db5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DB5	11628 bytes
SHA-256: `5b90dbe45e3bbd80629c5fb4c0986282278176080c99ce47f0b59325a245b7fa`

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