PDF malware analysis — malicious · 622551c7c672a2f1

MALICIOUS

PDF

89.1 KB Created: 2021-08-14 02:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: cc4a8e41447feda01d8ac5f48e8b2f5a SHA-1: 4abc6fee256f276cd676260caf363154e25f397a SHA-256: 622551c7c672a2f1fab81b963e8c7f0cee5c35763193e92a7565a507388a7f8f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, with one URL specifically mentioning 'download driver for printer samsung scx-4220 for windows xp'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites for potential malware downloads or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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://decaldankinh.net/upload/files/30678086267.pdf In PDF document text
- https://transmar.biz/ckfinder/userfiles/files/derufegofinafetosedesose.pdfIn PDF document text
- http://clingac.com/d/files/72523460136.pdfIn PDF document text
- http://begemot-rus.com/uploadfiles/file/2021060309271873499.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c91e07f91955b70d8447a1ca44cf7b9/vunagu.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/81104672476.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba885e25da0---2882462078.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d884d48fe2---xitunelutipisedidajovogu.pdfIn PDF document text
- https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa031153a6---3544021221.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/mogifi.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/71769050552.pdfIn PDF document text
- https://easy2ticket.com/upload/files/43029654947.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9fec5ac64a5ddea9cdd6fadcbd70f234/susuzarojilivid.pdfIn PDF document text
- http://supair-lux.hu/ckfinder/userfiles/files/fulotuzotafumuxanube.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fde1776f6---dawamebulega.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936d8e12e---jofij.pdfIn PDF document text
- https://brs.jo/userfiles/files/bekidovodubaw.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8130ae6df8c3cf30e6a9a9d77180787/xozajafodirafovav.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/541f5e791a73e240de8fe7567c10f434/49192825829.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e48e86ecc---gejelatofuwafiz.pdfIn PDF document text
- http://cochu.net/resimler/files/xokojebeduxuzowolotiv.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/e8g7qp5l3c9oru94t1905m6tet/78468166828.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7ukoak1p3pdpvc5t88maqrtar6/82494904451.pdfIn PDF document text
- http://autoneza.cz/UserFiles/File/87820835437.pdfIn PDF document text
- http://gyndoktors.de/ckfinder/userfiles/files/19282252220.pdfIn PDF document text
- http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/3648779013.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B4%D1%80%D0%B0%D0%B9%D0%B2%D0%B5%D1%80+%D0%B4%D0%BB%D1%8F+%D0%BF%D1%80%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D0%B0+samsung+scx-4220+%D0%B4%D0%BB%D1%8F+windows+xpPDF 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_off0000e2f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB09	23060 bytes
SHA-256: `29f29bdf66682ac02fc2c0e11459c1941a3462a37a3304ee25861227755ecdf4`
`font_02_sfnt_off000133dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133DC	12860 bytes
SHA-256: `d3f744b07dec594fe17692bb708951964a5cecca5d19bb32cbe5aa5236911e9c`

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