PDF malware analysis — malicious · 55af3529853ee8e5

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 02:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 67930b6a885808345c231e7cdca205f6 SHA-1: b370403296644b5fc0ea26df44ca2248132a965d SHA-256: 55af3529853ee8e56fc5fd3473ee8c89d98faeb5e58ef940fb991d92d17b8c0c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, likely for SEO manipulation or to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=gate+2020+brochure+pdf PDF link annotation
- https://celebicatering.com/upload/ckfinder/files/58742596153.pdfIn PDF document text
- http://www.pzkexie.com/up_files/file/vedotilinibodinez.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/68003860860a60acf28089.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086829b47e0f---vodimikepategebod.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijj7llf1gl29ho3vjqqficjd6c/37353142593.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/renegiraxojetufipujuleziz.pdfIn PDF document text
- https://zbmbudomont.pl/userfiles/file/67036955228.pdfIn PDF document text
- http://computergramm.com/userfiles/file/690076236.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/sumituruk.pdfIn PDF document text
- https://cdmsig.com/ckfinder/userfiles/files/97891317469.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/zubelilizezonorag.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1783661993942bb2b148f178eea9fbbb/pozuba.pdfIn PDF document text
- http://leakefamilyreunion.com/clients/63964/File/9212444070.pdfIn PDF document text
- http://stillwaterponies83.com/clients/74660/File/vujuzeres.pdfIn PDF document text
- http://adidravidar.com/ckfinder/userfiles/files/99982262244.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dbbbd6862916619928763786808d8e19/faxevibapowagoxiviw.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_off0000bfc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFC3	16972 bytes
SHA-256: `50ea2fb16f5398a632910099660c8e242c3a01565c12470462c061e67aed8db8`
`font_01_sfnt_off0000ebba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBBA	10828 bytes
SHA-256: `b73b460308f6148c009c7c16bdc5c9e6dbf5c4549b1e11b0bdde1724f55d6b99`
`font_02_sfnt_off000104b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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