PDF malware analysis — malicious · 43fc45cbb9c1adc8

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: f6a50b6c4596da028629583044f61ea8 SHA-1: 53d67175d29ccc64d5e913bdeea191b21a34d7ef SHA-256: 43fc45cbb9c1adc8b922cfddcfcaa606bb16dd085a2807d40436ced41fc74a78

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or redirect users to phishing or malware distribution sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=mitsubishi+lancer+1997+owners+manual PDF link annotation
- http://chickenwild.com/upload/contents/images/images/zajevujijujifalusedogeliw.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sute2jq34g8plpde6gaqhg9p7k/52204343707.pdfIn PDF document text
- https://europacreativaeuskadi.eu/files/galeria/files/depaxuzefususuxefi.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hi4d0qc79sokcbdbhnkonabum3/reverazozokoduzofipuref.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ef6987a1---9694177852.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612950ab5761c---21355900703.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/nofilorufikitulofoseba.pdfIn PDF document text
- http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rogipepaganarap.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/91822202107.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0ffe6664d9ab5f9830915ae015f83708/43052522356.pdfIn PDF document text
- http://omegapizza.net/uploads/files/xipanofogopozemez.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/pudiwajowulomedejasan.pdfIn PDF document text
- http://nsk-nalogov.net/upload/files/rexemeloborujakesaro.pdfIn PDF document text
- http://denis-lefebvre-services.com/fichiers/file/17805970788.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/73cfd7928ec512c4185936114f804894/1396840300.pdfIn PDF document text
- http://jurabos.nl/include/editor/file/14708518460.pdfIn PDF document text
- http://yuanhebiotech.com/upload/files/jiwevuxub.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/64853ei4v171afvnm68v15ubsv/69474052426.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/6491910592.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a202c4b260---82162250248.pdfIn PDF document text
- http://ubestsports.com/imager/files/20210802160424.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/runazirunaleparidozo.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ce7c8f89---22184394482.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/memujoxudu.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b36c3641f---laxibozinututiwikete.pdfIn PDF document text
- https://securityguardsupply.com/php/uploads/file/rorav.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_off0000f10f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF10F	18360 bytes
SHA-256: `71acbcb7a48c65d932f28ffe08269c8147480c6f0d6222367fb7cb68f7c39213`
`font_01_sfnt_off000120cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000138e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138E4	11084 bytes
SHA-256: `c9c47b92a48b7b572c88de1cf8deb7f4b22fce55379f2ca1611edadb9117d383`

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