PDF malware analysis — malicious · 90eafba12c08f4cf

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 13:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2b32e99c42d6a6f330027bfe3316f828 SHA-1: 33e224bbe7264f337ee299c0da3e78115999c990 SHA-256: 90eafba12c08f4cff494c1251efd673a94c917316ac2923b318e579c8143f215

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised websites, likely intended to trick users into downloading unwanted software. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://5thaveseniors.org/userfiles/file/72887023319.pdf In PDF document text
- https://yuanfuconstruction.com/ckfinder/upload/files/gekubidajefelib.pdfIn PDF document text
- https://saksisan.com/upload/ckfinder/files/80008530442.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f47a85e6d---41635189869.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/32260130238.pdfIn PDF document text
- https://sukaunited4d.vip/contents/files/pubibadavotofajugabiga.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0ickmiditrn629r93lum8o2cvv/nokaturidajugijusabira.pdfIn PDF document text
- http://thsport.dk/userfiles/file/13896793827.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398358a50ae---jukadajesudaxarawonaputo.pdfIn PDF document text
- http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91247936294.pdfIn PDF document text
- https://watfordfairtrade.org/app/webroot/img/files/widesalesoxow.pdfIn PDF document text
- http://interstroy96.ru/uploads/files/dovafigiwuzu.pdfIn PDF document text
- http://www.mueblesgamez.com/ckfinder/userfiles/files/ranesomi.pdfIn PDF document text
- http://egitara.com/upfiles/files/modejuv.pdfIn PDF document text
- http://biurod9.pl/public/userfiles/file/nevixewijolulimel.pdfIn PDF document text
- https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
- http://ovstav.cz/app/webroot/files/files/1253435936.pdfIn PDF document text
- http://gesundheit-im-blog.de/userfiles/file/wobozifawamidijoboruberi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+cryptotab+browser+pro+apkPDF 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_off0000b570.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB570	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD87	10848 bytes
SHA-256: `29cdf3897be11f8a9e893f1090e17cc16b2e4934e83e7532991cd5834d917eae`
`font_02_sfnt_off0000e698.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE698	17924 bytes
SHA-256: `b3aa99e276fc6fe3806324b8041743136d16ca4602997509cd5c9fb68e5eebad`

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