PDF malware analysis — malicious · a1cb30a121c07a50

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 11:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 239e162e4babe6eb97b26a3fb989c143 SHA-1: 7fc2c8030542686185483926169956e3d071887f SHA-256: a1cb30a121c07a50b5b162d88a888c8e68d53d2f0ac96814308cda25082b84b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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=star+wars+kotor+apk+ita PDF link annotation
- http://ecohouse-lab.com/userfiles/file/bosixukupafomosujan.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dbb3a74a5bafecde2ecd460193166029/73560408529.pdfIn PDF document text
- http://shanghaicruiseparty.com/uploads/file/76599623152.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143744e70af1---84228909856.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614800ba488dc---3605141430.pdfIn PDF document text
- http://bagiez.de/userfiles/file/rexujasaguwef.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/83413343365.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/54419301261.pdfIn PDF document text
- https://sitycare.com/FCK-UserFiles/files/13805940800.pdfIn PDF document text
- https://shen-su.eu/gfx/userfiles/files/metanagitofugovajal.pdfIn PDF document text
- http://gimhaejazz.com/fckeditor/userfiles/image/66300457489.pdfIn PDF document text
- http://getvisa.ru/images/File/86471687192.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/76626776925.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/036be286accd86d55692bbc8606a4099/95738844013.pdfIn PDF document text
- https://ancoraeducacion.com/images/94891595252.pdfIn PDF document text
- https://livres-arts.com/ckfinder/userfiles/files/7336533773.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/84196038132.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/dujofovaraxigigenubutas.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/r397l32q0rqn4fsbm7g101ae4f/tibuxeroxomubidab.pdfIn PDF document text
- http://cpbnatation.fr/fckeditor/userfiles/file/bewizo.pdfIn PDF document text
- http://bora.su/ckfinder/userfiles/files/supesowagiwirun.pdfIn PDF document text
- https://uzsienis.cvzona.lt/resources/img/files/tabegonisinoteko.pdfIn PDF document text
- https://volnynaklad.cz/data/file/gadun.pdfIn PDF document text
- http://cegled.varosom.hu/userfiles/files/1345951822.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_off0000dc94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC94	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4A6	18028 bytes
SHA-256: `58c340cddbc43edb449af76face23fc6f621f2de56b2d259b85bc3097c1ff960`
`font_02_sfnt_off0001237b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1237B	10216 bytes
SHA-256: `12353ac6e5b9fc91caa3ee9c2de8af933ce322a6fc9ebcf9bc20635aa7bfe7c0`

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