PDF malware analysis — malicious · 652697748eb6581e

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 23:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a06aa0c72b5e7fc013be7861ee15e56f SHA-1: 47ab0c9ed5bdab0f33fa8120a3c69010860b5d9d SHA-256: 652697748eb6581e2b152b3afb5607c805e102ab75d81b7fc39f5a2b495094a0

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 it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=how+to+add+a+column+to+excel+spreadsheet', likely serve as lures for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=how+to+add+a+column+to+excel+spreadsheet PDF link annotation
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8aa743bfabd2f83c46ae4bba81a33508/94847645842.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085681ebe4fc---wixesefumufimovoza.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d5cde3fe2630656a9d787159cde1ed45/30770618827.pdfIn PDF document text
- https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/0k5sjtq3b1cuke36udf9qslael/18239319210.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc66f1efa8---71753695223.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/491da4cc1a1e518b88846f9f9c487fed/7877148552.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/rejulenebetujakunuxefofu.pdfIn PDF document text
- https://legyenegyjonapod.hu/userfiles/files/juluzerun.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/eb88b3cc31b36d42c654cf1658ff9f6f/wipadapizuvanukumovixa.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a35740e3---zinamibigipogejisikob.pdfIn PDF document text
- http://beijinghuojia.cn/userfiles/file/50635475042.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3a5fc51229e8a08a0e43e9294e1ee843/tomaruxalup.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b871223e8f0---manafatamuriwurevopok.pdfIn PDF document text
- http://tablica-nieruchomosci.pl/uploades/fckeditorfile/penaxuzav.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183ff8dca2---nababafotuxomamemuv.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4116625772798da966ada7ff11a7dd12/68955850860.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/nelidakuwe.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/37238772799.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b1b263695---64492169421.pdfIn PDF document text
- http://chiaranannini.com/userfiles/files/gupisilawefusasixexepise.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fc57685c---xizogozamewo.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d571af9da79---54102992045.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce4803564---bubiv.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8527843c---jaxuxegivip.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/eb5ebaf46218d1082ce42c149dca346e/26670617470.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_off0000fc00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC00	18632 bytes
SHA-256: `ba9cea0831f39e975a51022151e40f2da5f0448ea791a28e654aab9aeb18970f`
`font_01_sfnt_off00012b3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B3B	10964 bytes
SHA-256: `fb928294a0c79d413534f1bd98136f057f6c9fc217b75a225cd4b9c77994ffda`
`font_02_sfnt_off0001448c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1448C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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