PDF malware analysis — malicious · 86a4109d05392860

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 00:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3b36e32724b6178e2318e49e045f03f4 SHA-1: db714221f42f6190fc894e58aa1ef78a40167210 SHA-256: 86a4109d0539286094e37a62343de672a0884eb96f86a3a8190fe3820ebe1310

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users. The primary attack pattern appears to be luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=hard+questions+with+no+answers PDF link annotation
- http://kibbkw.com/uploads/file/65592784410.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc61d690b---xikudasijugike.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/22201757645.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dd13ba3c---30650559114.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d136c803---gijidigafitakoz.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3223677e80---22949568212.pdfIn PDF document text
- http://pogotowienaukowe.com/Upload/file/sakidaba.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b6319937d4a8d03cabc1074520ceba3/5266130492.pdfIn PDF document text
- https://study-abroad-travel.com/ckfinder/userfiles/file/gunogiz.pdfIn PDF document text
- https://llsindia.in/FCKeditor/file/lowederufelavaxegeves.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d06aee3bafd---pagoxikisudabunobafew.pdfIn PDF document text
- https://europawindow.com/app/webroot/img/main_content/files/virebezu.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9dca3aa89b653a038ec8b86df84dc195/vukarebuzerijepobedago.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0e08538d26737f16bcd3076835fd266/zapavojamupif.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e0c38096bfe418d9e2a08ed5c8964906/99994930471.pdfIn PDF document text
- http://longthinhphat.net/uploads/files/18549722723.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9686da71f85b0e505dbc3eb538475400/sifabubexovasew.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/bepevusa.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/97359a5e1eaf6a1af432054e46b7b30e/befijanaxusumigaxazox.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5qlbpqdtk7cd33hjk46vba27q5/begevogisu.pdfIn PDF document text
- http://daydala.com/userfiles/file/pomesasipalisoxuwa.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/09c84dffecf666e823f1cf5d0adac3cd/99340707981.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38d0f3ac0---suguguribebupirulugujori.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161934f146---39377761981.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b242f5dc---88833478821.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/lh6egan0603kpbvquf8p5hsrjp/weronak.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_off0000efb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107CB	16376 bytes
SHA-256: `0461c0a1a573d43d3d385859c856951e9895de8acd928a17b267ab0940b7b59f`
`font_02_sfnt_off000131f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131F8	10624 bytes
SHA-256: `2e58c4f7861ed641ec067c19b9f3136311efaaf7e22d9904205bfb7af186bf2f`

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