PDF malware analysis — malicious · 42d3ed7baae11fc2

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 432b805bd9ee34aedb2dcdfc45c4b0d5 SHA-1: 8c6b4b911cb3c66c8305a117433de16f346fa710 SHA-256: 42d3ed7baae11fc29147176d687f0ab3d47d8f5feb723e0b2ea7fdbbe75d944f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of embedded URLs and the PDF's structure suggest it is designed to lead users to malicious content, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=wallpapers+for+redmi+note+9 PDF link annotation
- http://oreoltour.ru/sites/default/files/file/37010825173.pdfIn PDF document text
- http://liily.jp/upload/file/20210906200915.pdfIn PDF document text
- http://drironcat.com/images/file/35438999042.pdfIn PDF document text
- http://cl-metalparts.com/d/files/59305720054.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9ea5cd0---retegunibitolevive.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/disoka.pdfIn PDF document text
- https://www.prshots.com/ckfinder/userfiles/files/52306550698.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/90b2aa0fb83f5e19b7156f45f9b35dc0/sonif.pdfIn PDF document text
- http://castudio.eu/userfiles/files/35554967716.pdfIn PDF document text
- http://sakesushilakehavasu.com/uploads/files/11138804998.pdfIn PDF document text
- http://zkmeiqi.com/admin/ckfinder/upfile/files/74722785983.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/bopilekodokufuvan.pdfIn PDF document text
- https://icon-studios.com/userfiles/file/62482943020.pdfIn PDF document text
- https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mijoludije.pdfIn PDF document text
- http://fujiya-burbank.com/uploads/files/rivakifobanew.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210916185202.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a298b372e3f9588a25b96386c5fd3e26/75604857373.pdfIn PDF document text
- http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210916000707.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161406bd15b9ae---87024192882.pdfIn PDF document text
- http://tksvolga.ru/userfiles/file/39930237873.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414459bda5d---57110805356.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/runonilixokiga.pdfIn PDF document text
- https://www.casestilistas.es/ckfinder/userfiles/files/gewuvebuwegizudoxulimok.pdfIn PDF document text
- https://wct.goldcrownresort.com/magazine_files/files/wosezenaw.pdfIn PDF document text
- http://vngo-cc.vn/cooker/public/files/welekemob.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_off0000ba6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA6B	15952 bytes
SHA-256: `176839af41edf94309b395e51c88ac35aeb284f4471999e9abd541c61c97a4dc`
`font_01_sfnt_off0000e307.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE307	10820 bytes
SHA-256: `d05de1534bd2135ba5fc4eede7a041072d2900677c105b4e3abf268903fa3955`
`font_02_sfnt_off0000fbfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBFD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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