PDF malware analysis — malicious · 52b380f83976b657

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 13:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: ff4c7a2560420467598d1b7f8a8172a0 SHA-1: a2b848e0aeec0e583983748391fd8ce24ebef9be SHA-256: 52b380f83976b6577f6ffc4f53ca81a38440f7d114a00107db8752e6dd003c70

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=all+about+escrow PDF link annotation
- http://studiogaleazzo.eu/userfiles/files/kulizafibunudazajute.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8426999d2---minumoluzijuvilig.pdfIn PDF document text
- http://dija.lv/public/userfiles/file/29743398889.pdfIn PDF document text
- http://cnsgafgl.netsociality.com/upload/files/51088066312.pdfIn PDF document text
- http://bibrka-school.org.ua/ckfinder/userfiles/files/12430177086.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a72d19bfb---5476085168.pdfIn PDF document text
- http://lavalnerina.com/userfiles/file/51093427680.pdfIn PDF document text
- https://ijp2.com/contents/files/18619589066.pdfIn PDF document text
- http://kaie.org/userfiles/file/20210912212635.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3019284d5fb8837f194b1f368de39e71/25908080439.pdfIn PDF document text
- https://rtaadmin.mrv-educationservices.com/content_file/files/98501659361.pdfIn PDF document text
- https://www.habitat-morvan.fr/ckfinder/userfiles/files/48850242321.pdfIn PDF document text
- http://abpjseah.news-read.com/upload/files/37271759097.pdfIn PDF document text
- https://globalcareerclub.com/FCKeditor/userfiles/file/jejibim.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/jaremadenevedasekilewom.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe466b808---luvom.pdfIn PDF document text
- http://klawiatury-foliowe.pl/_data/file/tusomifufuxolotifoxaxa.pdfIn PDF document text
- https://www.prieur-equipement.com/ckfinder/userfiles/files/32373533276.pdfIn PDF document text
- https://themis-lex.com/userfiles/files/33236162777.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152f7eda4d66---xonurusubipaxalo.pdfIn PDF document text
- http://netcentricnj.com/ckfinder/userfiles/files/6110945770.pdfIn PDF document text
- https://tttinox.com/upload/userfiles/files/difafewejotetogufobig.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xuzazitokozewuwobubuduw.pdfIn PDF document text
- http://classicalgardenfountains.com/uplds/file/rowosesimuxifu.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_off0000b0b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c8c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8C9	10336 bytes
SHA-256: `6ec4e8622019fb9fe4e367f5ac82652c74890e0bd9ac8c7f2e88eb323c74144b`
`font_02_sfnt_off0000e068.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE068	16628 bytes
SHA-256: `9b9952a10446f36783046d6ec6504396bfc74f2bf10e21b8714ddd3bf72cdfe2`

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