PDF malware analysis — malicious · fd605a7155364599

MALICIOUS

PDF

119.1 KB Created: 2021-09-03 04:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 962ddd3deabc2f3ce5c1d54d955b28dd SHA-1: 7cd7949b5f86ea15aba31ba8241f43075fd3651e SHA-256: fd605a71553645994e700b7e87b1c6295cf5cf72cc32cb930fd1ba08c5ce2cd3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to lure users to external sites, likely for credential harvesting or to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://synerhu.ru/uplcv?utm_term=alcatel+u5+manual+espa%C3%B1ol PDF link annotation
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072850c34e4f---remafelapomegapogufoxi.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0fa01a57e---47955614027.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/32af3030ef7cd6b9c3223ba507a0e714/fised.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/wifukaxanulu.pdfIn PDF document text
- http://szkolka-wiercioch.pl/files/file/67922338130.pdfIn PDF document text
- http://linza-market.ru/upload/files/98649173055.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c5esmfs3i2dpvp18q2ukeb0pmg/1874261808.pdfIn PDF document text
- http://ambvet-trefontane.eu/userfiles/files/nifoma.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1c57f076---vilufokudur.pdfIn PDF document text
- https://tumsad.org/img/editor/image/file/lijegewobulekusunowomej.pdfIn PDF document text
- http://universalestetic.com/userfiles/file/zawewasuk.pdfIn PDF document text
- https://hankilfood.com/upfile/files/44521635475.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/modalojavoxajar.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610804cec9c7e---45729307720.pdfIn PDF document text
- http://propellerclubsandiego.org/uploads/files/nalabawobuluxufad.pdfIn PDF document text
- http://stroisvias.ru/userfiles/file/111127959.pdfIn PDF document text
- https://alrukn.co/userfiles/files/43753465534.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607734e35bf72---midetuseribixekazezu.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/78378570d9a6b7122a4b26acb3fe9fb3/49568982368.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3ae831a0e43f16da6a0369a46f7fa81d/33166643068.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7b5345ab9e37151a9005734120d7d5d5/xizilunovawaz.pdfIn PDF document text
- http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/9835089673.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3cdd2ccd219eba8143af66a35b798d1c/lubilora.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf6841a78---18737039313.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825c4493988---12054854099.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_off000167bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x167BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00017fd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17FD1	20032 bytes
SHA-256: `522c6f6ed5cbd61f21ee6bce9a07e33d764c9fa841d9ca6a7c8849202719c236`
`font_02_sfnt_off0001b3cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B3CB	10764 bytes
SHA-256: `b834a1abf428e0939717a6c2c8e31fb867ec78c29bb76d83728a686d944f43ac`

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