PDF malware analysis — malicious · 915b098b4dafe240

MALICIOUS

PDF

74.3 KB Created: 2021-10-02 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 077ba4a6177c6f9ba5e5f4c61d9f19a0 SHA-1: 585ab1c5ffe8d47e6699f7adfbce665042db97a7 SHA-256: 915b098b4dafe2405d142ee8c44fca2f67ebc8d8e07ff7cac8e31a45990b1376

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/30b63567772399accb932d43bf88d827/kufesuvobewag.pdf In PDF document text
- http://spodne-pradlo-2bpoint.sk/UserFiles/File/54707299473.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f02694f43b3487227a49f62726892867/mokesegijojawunipi.pdfIn PDF document text
- http://elfast.ru/userfiles/file/zelumazumemonozisitomupe.pdfIn PDF document text
- https://www.studioline.ie/ckfinder/userfiles/files/viwexemefenirodanep.pdfIn PDF document text
- https://vadihosting.com/calisma2/files/uploads/pidaz.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/36777020395.pdfIn PDF document text
- http://asustainable.com/global/file/94248133875.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d10a41bcce6aa31319a003c24b26863/zavatajawezak.pdfIn PDF document text
- http://sparan-art.ru/ckfinder/userfiles/files/58571474593.pdfIn PDF document text
- https://spcinternational.in/ckfinder/userfiles/files/befari.pdfIn PDF document text
- https://mabuksusu.com/contents/files/46519509167.pdfIn PDF document text
- http://roseeskin.com/userfiles/file/20210906020025.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/46nlvg6amo7pkfbmps58c6lji4/61426212644.pdfIn PDF document text
- http://rothemtour.com/FileData/ckfinder/files/20210906_5AAF2F3BD4C2956C.pdfIn PDF document text
- http://problemconsulting.com/img/download/files/siremepunusegusinisakixeb.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/gebateluzi.pdfIn PDF document text
- https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202110/file/vevinazidepabe.pdfIn PDF document text
- http://methese.com/upload/files/sevigabogurewukoxa.pdfIn PDF document text
- http://southerncross-ex.com/images/blog/file/sobari.pdfIn PDF document text
- http://mcap.cz/images/uploadedimages/file/lenuzezarizu.pdfIn PDF document text
- https://lombardpruszkow.pl/local/userfiles/file/52518429514.pdfIn PDF document text
- http://coca-colalife.eu/userfiles/file/87581807251.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437b1232728---38768102985.pdfIn PDF document text
- http://fireprovietnam.net/luutru/files/wubosonizokox.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=scan+and+fix+drive+windows+10PDF 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_off0000bbae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3C5	10828 bytes
SHA-256: `d2ca49eafac5059d60f87994c80bf154860a193fcc90326159a3e1d5e55ef5f2`
`font_02_sfnt_off0000ecfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFC	17820 bytes
SHA-256: `ba5f3a1f1650715b269c0f5a108bd3724732fff6e6f8b4ed8b3ec137e3b5ea55`

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