PDF malware analysis — malicious · 9f6566251f017047

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 13:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d938b04a30108518dd2f59063fbd0d07 SHA-1: c120603b09d45c4f775ae2fc08a16e9e4af3c679 SHA-256: 9f6566251f0170476946d2c156af64017274e90a3b280de47b05932531bd3db9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using link farms for malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=dear+comrade+malayalam+torrent PDF link annotation
- http://art-lan.ru/uploads/assets/file/matojegele.pdfIn PDF document text
- http://ajk-opakowania.eu/upload/fck/file/90178953008.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fk88df5htr42kr7ln0dnslu297/lovukewovuriwirataroz.pdfIn PDF document text
- https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/vufedewener.pdfIn PDF document text
- http://canadianrockies.ca/files/file/75893368879.pdfIn PDF document text
- http://jysfh.com/upload_fck/file/2021-9-6/20210906103806692153.pdfIn PDF document text
- http://npas.ru/pic/file/birediderexupebivogat.pdfIn PDF document text
- https://dalycity.com/wysiwygfiles/file/27157239593.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2fe44265a27eadcc42c5663f1794c1a7/wuxanevixubararu.pdfIn PDF document text
- http://kbidc.kr/upload/editor/file/1630798619.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles/file/webarozewafobivesuvazim.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312ab8bd1a1---wujikijadisafogagarew.pdfIn PDF document text
- http://headrepublic.pl/images/files/naxurusagef.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161350fdd1f875---75517679495.pdfIn PDF document text
- http://gucaoyun.com/uploads/file/111049365322.pdfIn PDF document text
- http://knowleangling.co.uk/ckfinder/userfiles/files/61546384519.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/334a940edde519b30f3ab11a731802b5/70544095103.pdfIn PDF document text
- http://www.farmaciavictoriayjmleon.com/userfiles/files/wujozafosedineliw.pdfIn PDF document text
- http://nationshield.ae/userfiles/files/93189075373.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613532da9eb35---bekedusizejotelonakep.pdfIn PDF document text
- http://hooleihomes.com/cms_images/file/metob.pdfIn PDF document text
- https://tsafar.ir/basefile/tsafarir/files/kedavababejawin.pdfIn PDF document text
- http://meijialx.com/ckfinder/userfiles/files/27813954343.pdfIn PDF document text
- https://nikosdimos.gr/userfiles/file/bubonixuvuwogosesozupenu.pdfIn PDF document text
- https://gruppopolidori.com/upload/image/file/72831471723.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_off0000b35f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB35F	15896 bytes
SHA-256: `cdbd5bf95e5a5cf380357539a5bb1455f15a769c27730c03a540aaf23cb5858d`
`font_01_sfnt_off0000dc54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC54	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f46b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF46B	10388 bytes
SHA-256: `46a3f730b1ace24de02a3071cb01a36bbdf6cbc95c8aed43a85b067b00e8865e`

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