PDF malware analysis — malicious · 636bf3a35664f1ab

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 23:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 674867ca2fb108f6d6b44b5586bda82f SHA-1: a508f2016169cb659dcb2a1ed7ce49566ef63bfa SHA-256: 636bf3a35664f1ab96929e4a0c17edb674777134432c742c6e9c2872ff9e9ee5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress uploads and disposable hosting domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious sites.

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://washchienluoc.com/upload/file/73663765829.pdf In PDF document text
- https://igraonica.me/userfiles/file/koleboguki.pdfIn PDF document text
- http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/11938184792.pdfIn PDF document text
- http://csptech.net/admin/userfiles/file/4030545386.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/73605052974.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/c79253ev8bqoigmpet5s5jtg4p/xuwenujuzuvogi.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ccd65b3356107ad7c803c32d356bb8ee/68795393287.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160947d21d29d8---nigigexonoguninamutap.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5d46d24422f2792ac8330c2546178ee7/lodopepobas.pdfIn PDF document text
- http://msamericapageant.com/clients/873634/File/jorubetewa.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ci7tq7pon5dqi10dfgmr30abfl/63330254929.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/36490322494.pdfIn PDF document text
- http://www.celso.org/download/pejuvatososuwikegajuv.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/9582391331.pdfIn PDF document text
- http://fandimnarodaku.cz/upload/file/katalojulimubitudexewob.pdfIn PDF document text
- https://rh4-h1tapi-turbo.com/contents//files/42330573852.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/88d45a89ec049d2ad3ed6b09bf1ae653/20348551023.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80d68d9a8---towojunurivitux.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/razer.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2e64be8b---40412047749.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1148e0012---48270517465.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1f62084f---fanomovimumevuliwulafodu.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758428fe25---59504843029.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f3jpdqfatun255r4d5blskmk4v/xulomikepigefefufotor.pdfIn PDF document text
- https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/65177191097.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=basic+computer+hardware+parts+and+functions+pdfPDF 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_off0000da20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA20	11076 bytes
SHA-256: `a1345e92f3ea1f3e3974d287b4cf374172109b6a0db1fe0e6dd6ffb7fc59f70a`
`font_01_sfnt_off0000f3df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3DF	17012 bytes
SHA-256: `03259323d8fd416f1726ef7fc0e6af8ddff4652d478d139aabc68e370c0586ed`
`font_02_sfnt_off00012027.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12027	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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