PDF malware analysis — malicious · df527134f92a2a75

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1d3c579588fc5d0e975cf7adee6b6b25 SHA-1: 1ee6fe63feb4884625202536afe145ae88b4c9b7 SHA-256: df527134f92a2a75f3ce80347ea2548ead15b5c12e91e63416abd81fc528aa71

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or falling victim to phishing schemes. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://mollis.rs//files/batopufezubunibarekukiju.pdf In PDF document text
- https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jpjs6a4glghiviq9v9od733q6i/41541645447.pdfIn PDF document text
- https://pmms-online.com/assets/file/domesezel.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/78962522128.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5f15948826b73ae2438bcaf77356593/jamiwaf.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7cc27ead17cfdfad3380463a251380a/kafupilelutasowaxufobufe.pdfIn PDF document text
- http://wefocusdesign.com/upload/files/sinopika.pdfIn PDF document text
- https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/41e35f4710bb8123d3256918442713cb/1089731736.pdfIn PDF document text
- http://thetuckerfamilyreunion.com/clients/67950/File/11301371773.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e6c13f7c---parozumavomigojomemexebor.pdfIn PDF document text
- http://3qlohas.com/CKEdit/upload/files/97030507377.pdfIn PDF document text
- http://esistore.be/userfiles/file/kobilusarux.pdfIn PDF document text
- http://www.stadion-zarya.ru/ckfinder/userfiles/files/kaduzal.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/avewinotekimofiluxiwajap.pdfIn PDF document text
- https://noihoithanhtuan.com/media/ftp/file/57308492206.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f8173189---11281605553.pdfIn PDF document text
- https://techson-cctv.com/upload/file/sinotu.pdfIn PDF document text
- http://elma1.ru/!upload/files/44775715441.pdfIn PDF document text
- http://zamel2.pl/userfiles/file/44061644936.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/jejos.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ff47b4a8---51456927938.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/vovemikefosabo.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac202d70497---38777445868.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b48e7a0c3---6259759134.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773bd94be3---6369971436.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/kudazipoximapofibe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=canon+in+d+guitar+duet+pdfPDF 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_off0000d78b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD78B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA2	10588 bytes
SHA-256: `de7c4eaed50b8953dbc809354b86e4ac9bfef0a9389b726788c9d3b2aefc07d5`
`font_02_sfnt_off000107bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107BC	16672 bytes
SHA-256: `b8aaf23daf84f2dc73e8f71cccfd652934ff3096de1c99bb6c60ed85d0bc2385`

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