PDF malware analysis — malicious · 8d789cb92a51e01e

MALICIOUS

PDF

80.3 KB Created: 2021-08-18 05:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3338672c59ad053f76a0d6435a350906 SHA-1: b252e8fbf028865b8b7825e7a0d20a5fe8ee06c2 SHA-256: 8d789cb92a51e01e322917fe38a653e2aedbb1814887f2069384db000d5a3ceb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely leveraging spearphishing attachments to deliver users to these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=how+to+hack+bleach+brave+souls+android PDF link annotation
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/93cf71ef207132993a60ddd54f140fc0/devite.pdfIn PDF document text
- https://presstone.hu/userfiles/file/52297701112.pdfIn PDF document text
- https://aildf.in/userfiles/file/77966501235.pdfIn PDF document text
- http://opt-russtd.ru/data_center/upload_pictures/file/23906466214.pdfIn PDF document text
- http://autoscuolepintozzi.it/userfiles/files/wagufiwodexukikepuvazivoj.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc518bl3enksfn8qmg324aqbqh/49620014356.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8825bbd808---73636718354.pdfIn PDF document text
- https://alnahamgroup.com/userfiles/file/56142001633.pdfIn PDF document text
- http://yourhealthyanswer.com/ckfinder/userfiles/files/zanikenorajotijojepetil.pdfIn PDF document text
- http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/rujewiromiganuwotadakox.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/4216243042.pdfIn PDF document text
- http://seoulgreeter.com/userData/board/file/68652170574.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/595d25444134acdd09dd4c0c5a78f56b/73506536869.pdfIn PDF document text
- http://enjoyisagenix.com/ckfinder/userfiles/files/59824982942.pdfIn PDF document text
- http://kppzp.pl/userfiles/file/terixisanalunafakevimuv.pdfIn PDF document text
- http://ckrestaurantgroup.com/ckfinder/userfiles/files/88122613496.pdfIn PDF document text
- https://lienlacanien.com/img_pages/file/2347111588.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f6422613---xejevugizazejobusaruton.pdfIn PDF document text
- https://myphambambi.com/webroot/img/files/22928056816.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd9533379---kodewug.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161100da247d8e---watetutisul.pdfIn PDF document text
- http://parfumerieindex.nl/images/uploads/50282274750.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da5b8b801f115b59df5083d7fa04a7da/repezelowujinewavibo.pdfIn PDF document text
- http://weberstellen.ch/userfiles/file/lemaromizakutovuf.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_off0000d4bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4BB	17204 bytes
SHA-256: `37786ab9180f14629b54cead4301e2b209db6d57f93c0179f72fd7a9e56a2a1d`
`font_01_sfnt_off000101f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A0C	10944 bytes
SHA-256: `df32465f89580e45fad06b091f02415a615e5216c49c887a96eda3296ccdaa4c`

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