PDF malware analysis — malicious · 24d5278f9a056059

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 21:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9c9a7f616c85dbe1f683cf268b8b3159 SHA-1: 82f7f05b6e90c6e07cf21411d7779eac038052cc SHA-256: 24d5278f9a056059e39f7c355f4263ab750c1da5bbdef62b9973efd72c04b1c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://harryreichert.de/uploaded_pics/News/file/76248910977.pdf In PDF document text
- https://solener.info/ckfinder/userfiles/files/93367463790.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6b413e66---rekagewod.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/bb604de09de4b6bd1332d79367aec4d5/11167439741.pdfIn PDF document text
- https://stonebuild.bg/f/uploads/files/9604234711.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814e4d95e5---29185934587.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9677de4938ffb2f04e67d2859402a2a6/kejad.pdfIn PDF document text
- https://cobaltinc.org/userfiles/file/wozewuramisilukudixiju.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b6b3be6a813e968f84fb7f337b2b1c22/jokalirufo.pdfIn PDF document text
- http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/rakojazifabisosemosopik.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3630b39dec---51047063645.pdfIn PDF document text
- http://ipoz.pl/userfiles/file/senovosowutekobut.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edd88f022---97291092965.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bba7b8e44---fabekozasovipumisuz.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/lividejegokewi.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a479593984e59c3b279dd5393c7a8e9/60528035130.pdfIn PDF document text
- http://dzirerealtors.com/uploads/kemidowogasufenodamuwu.pdfIn PDF document text
- http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/kiralezaxaravuzija.pdfIn PDF document text
- http://autoshiftbid.com/fckeditor/userfiles/file/fodinatidugoreb.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea08aa7d46---marab.pdfIn PDF document text
- http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/66467088182.pdfIn PDF document text
- http://ersatzmonitor.de/userfiles/file/28682018405.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fd84f00209bcce20e0f966dcb8ee9216/80148703520.pdfIn PDF document text
- https://bahispesinde.com/gnc/veri/_files/raxagebowegasadexujutived.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7husb6ec62n3vls51rm5ghfo3/76122271140.pdfIn PDF document text
- http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/53813983637.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=%C3%A2ngulos+complementares+e+suplementares+exerc%C3%ADcios+resolvidos+7+anoPDF 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_off0000df7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF7E	19496 bytes
SHA-256: `744ff2c60be1b26374a8c83f6343981a29824e82f68307408e4d4393845a40e2`
`font_01_sfnt_off00010f79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F79	11244 bytes
SHA-256: `fa9f73bd1567dc38e24d150a015dc2b8351a6430806969cb3df6cdd00211cd0f`
`font_02_sfnt_off000129c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.