PDF malware analysis — malicious · 3337c7193ffc7295

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 02:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 52cadad5e500427ff1de8bdce84932ee SHA-1: 28b2fd064c1b85bd2eabb9708546c5182be914f8 SHA-256: 3337c7193ffc7295dae394570a40d6dd599877fa49c497fb7e1b851f718f0eac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://atavio.ru/files/file/48519132425.pdf In PDF document text
- http://vssteel1999.com/ckeditor/userfiles/files/pivovurojo.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19e85204282815b896c905c48138a226/78081045704.pdfIn PDF document text
- http://hz-karavany.cz/ckfinder/userfiles/files/76098177332.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnuop8qsdpahv57shlel7fruk0/15557516436.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160777220659d1---42697307211.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e9cdb19b9e8bfd9bcf537f2097e68fbf/fisidojokuxalokabiwexinid.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61aaa0fbe---18563695928.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7b049a395fc8c150972636b3f8475dab/xuwifurevilikufix.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16072be308091e---saxevikiriromalu.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/18ebaed0ed06b8744ade32cc66113710/dowipunewurijeraxozam.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/33738612547.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e04f4caf3---kifefas.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/nareriziberivava.pdfIn PDF document text
- https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/fd9b8dabd2fcec145845b05b168191f2/dotifuli.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9f10143bfd468ae0faf24b634bdc332a/94817910229.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96e98216c---vewukofesaxuvigaka.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b584f14b5f2---42933867655.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de62434097aa832e334f381198bda9d0/16334100488.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/lakomufawiboravi.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/75171457140.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783ab25722a---9898026541.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772d8cdb7c8---tividuvumabotewavid.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe16b046---sanobe.pdfIn PDF document text
- http://lpsa.cz/userfiles/file/xogifigipawomorif.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oxherding+tale+summary+pdfPDF 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_off0000dcd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCD9	17360 bytes
SHA-256: `c91a42312883f6429bac8b807eadc873a6bca355c421857e35502c674604fd32`
`font_01_sfnt_off000109ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109EE	11168 bytes
SHA-256: `50c7f71100a3dd1959f0a019719b2e2900e72c2387b4722b8b00e28940851430`
`font_02_sfnt_off000123bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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