PDF malware analysis — malicious · 35d222881bd2ceb1

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 1a62ca192edd09dc0f34de14e5a0f8be SHA-1: 7be3cf5b6771fad4e7c8879861bdd8e3bafab595 SHA-256: 35d222881bd2ceb188e2e82eb59d4cbe5dcdb639fc0f46d6fa7b132168f391ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware. The PDF structure and embedded URIs are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=new+battle+royale+game+android PDF link annotation
- http://srtcivilnorth.com/ckeditor_file/files/liwozigumajodasafosizaso.pdfIn PDF document text
- http://www.hz-kontejnery.cz/ckfinder/userfiles/files/ribasigos.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0qe0vmo48ur2j6m3fgnnfoh9h7/97253018141.pdfIn PDF document text
- http://www.musicboxpiano.com/contentfiles/37579139866.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0a2dc37f---jawonegitobipe.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbcda8cc2f---kokataj.pdfIn PDF document text
- https://kenkochaya.com/user_data/ckfinder/files/fuvisuva.pdfIn PDF document text
- http://pedraferro.com/files/files/werepupegarivatetuvaze.pdfIn PDF document text
- http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/33711058444.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ge6johp3o8o5bugdr6a2g87o2t/6458954887.pdfIn PDF document text
- http://ettorebelfioreliutaio.it/userfiles/files/49056142122.pdfIn PDF document text
- http://andrenickels.de/ckfinder/userfiles/files/3914589552.pdfIn PDF document text
- https://bruceleevideos.org/images/file/ruvip.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210908212726.pdfIn PDF document text
- http://grupopiscis.com/upload/files/39915856547.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/tolumatetizitorid.pdfIn PDF document text
- http://pinedafoundation.org/imageuploads/file/luralakusuniki.pdfIn PDF document text
- https://tanhaithanhvalves.com/quangcao/admin/file/8266908734.pdfIn PDF document text
- http://jjc-dev.com/userfiles/file/80968344894.pdfIn PDF document text
- http://dachastyle.com/userfiles/file/gupoziponowunokawaxoz.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613674dba51ef---72484188037.pdfIn PDF document text
- http://bentleyplemtech.ru/userfiles/file/30440560137.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee30375156---54164777086.pdfIn PDF document text
- http://abwvictory.com/uploads/files/kedojawabunirizi.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/73254214774.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_off0000eaaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAAF	16644 bytes
SHA-256: `7a97f05bbce0594c7582eaa4083e3869751238a4b2a334c9cf2916a5492d184c`
`font_01_sfnt_off0001151c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1151C	10740 bytes
SHA-256: `ad6a6656736d0eb2dc81b46e7ca8d08091854652fc2fbdeb3cf9e5873c8e5bf1`
`font_02_sfnt_off00012da5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DA5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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