PDF malware analysis — malicious · 93b03321c6b1cc8a

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 10:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2177502f41ecd1f3d7eaa41c08e70154 SHA-1: f99d4dee2ccc91a212a8a368c7c90f4b38bcd8ff SHA-256: 93b03321c6b1cc8af58d1ba0c94c5ec89a006e0f91550f256ff5942d1c630863

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=enid+blyton+stories+read+online+free PDF link annotation
- http://fiorenzuolatrack.it/userfiles/files/43334825374.pdfIn PDF document text
- http://sportservistocik.cz/UserFiles/File/pemodiridiniwa.pdfIn PDF document text
- http://www.mattig-accounting.bg/fisiere/file/turabivowizamefoxubobili.pdfIn PDF document text
- http://beamstraffic.ae/amb/userfiles/file/lumuzukufe.pdfIn PDF document text
- http://adas-muko.pl/photo/file/3734260653.pdfIn PDF document text
- https://flomogroup.com/upload/files/39911966119.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613b29ccbf---jeregitewovuziz.pdfIn PDF document text
- http://relaxzenter.com/uploads/files/27540576578.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/setuwegugegenifebuga.pdfIn PDF document text
- http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911142725806474.pdfIn PDF document text
- http://99hospitalitygroup.com/ckfinder/userfiles/files/judefutezavado.pdfIn PDF document text
- https://autosaloncenter.com/uploads/files/92311391207.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613785af9b587---levemezokunifu.pdfIn PDF document text
- http://taxiluzern.ch/khurasan/userfiles/files/tajurelonoxugepiropi.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/43079641003.pdfIn PDF document text
- https://247christianity.org/fckeditor/userfiles/file/sozekekigovamubikolosut1631488644.pdfIn PDF document text
- http://kustari.net/userfiles/file/6225530413.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbbcbeff4---bufukawaxinozidotafub.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414cbed0bb---69274843946.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fj2tk6g5d64d1ev66qr7m9kb30/bolegozanozewen.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/40010720603.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352044f2cb---5306680741.pdfIn PDF document text
- https://senfina.top/uploads/files/90071904387.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_off0000b481.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB481	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cc98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC98	10584 bytes
SHA-256: `29571b15255e3d8256e45b6d83c214a3e62ac851d032f552a1c63f6a28b45bd4`
`font_02_sfnt_off0000e4dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4DC	16792 bytes
SHA-256: `eb59270f56180097159330e5e17a0bfd70b3a3080a9b1c7a383b2f0aff4edf95`

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