PDF malware analysis — malicious · 4a54d9ecb33c1e88

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 00:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c27d5c78c39846911a0b074460d74fc5 SHA-1: a8cc42f33540bf17189df02a5bb09eea9f4e1d99 SHA-256: 4a54d9ecb33c1e8887808c10b411ff092b825d003b77c7cea5d36b5051efee75

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=difference+between+e1+and+e2+elimination+reaction PDF link annotation
- http://mimpishio2bet.net/contents//files/muzono.pdfIn PDF document text
- https://vicotelecom.vn/static/source/images/file/kesivupan.pdfIn PDF document text
- http://bsp-oblspl.org/ckfinder/userfiles/files/tusakifo.pdfIn PDF document text
- http://ebrinteractive.com/userfiles/file/sesozirujava.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094b57f41130---96880866266.pdfIn PDF document text
- https://adikkedua.com/contents//files/57760174435.pdfIn PDF document text
- http://ayurveda-shiatsu-nice.com/upload/files/34225387709.pdfIn PDF document text
- https://coonvalleycc.com/userfiles/file/67882211841.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c618a3e024---8699929694.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/74ikf53ursjhqn5196m6kb1b0o/81869393772.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcd1b6cfa---23982347754.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94caed325---71025590795.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/98735556239.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db91d7cd3d7---8047225221.pdfIn PDF document text
- http://palaciodelosnavas.com/userfiles/file/35433867473.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c030846ecbd---2962145013.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1058e2cf9---63155689866.pdfIn PDF document text
- http://sinoorchids.com/image/file/14488772339.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/lukivudebogupaxutibadov.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/depinimowexozivasago.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/kodoxiwafevudon.pdfIn PDF document text
- https://service-panev.com/userfiles/bilesamimofavajalida.pdfIn PDF document text
- http://surausa.com/uploads/files/lakofumisubebepoxixu.pdfIn PDF document text
- https://congchunghadong.com/uploads/files/rasewikape.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_off0000e87f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE87F	18112 bytes
SHA-256: `2ed5c685622f57fb1df35e4ec84cc292bd1a1088240d69148384ae7a82006e36`
`font_01_sfnt_off0001178a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1178A	10868 bytes
SHA-256: `f8dd7125761a0ff54aa969304c6b80fb1ffd95ccde828ce728ec8e2daa86352b`
`font_02_sfnt_off000130ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130CE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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