PDF malware analysis — malicious · 24c83ffa505310ad

MALICIOUS

PDF

127.3 KB Created: 2021-06-26 22:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 1a16541e907d44b2a2db93f1b9e30f9d SHA-1: 8447fae2719dd905c2fad1485d7aa1243596d33a SHA-256: 24c83ffa505310ad2849a9fe74431c817fa6e5e4a585a2b5498016d8d33510b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9878

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://garglob.ru/uplcv?utm_term=how+do+you+summon+herobrine+in+minecraft PDF link annotation
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1ii7hdnfs7gc66u6gjultcepf0/pasopetizaduxiwo.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160badd9c1e0b0---6828025572.pdfIn PDF document text
- http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/togumumodazafet.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/306d2e4a8f116b131ec1ba4991916a5c/zinufufenusagoxixovij.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41d42139---gubobulerozulunutiw.pdfIn PDF document text
- http://alltechsro.cz/files/11592256344.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1157d378d34cd26d6402e301baf6bc2d/5309557392.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c19fd79e8df3745d85f53f52765ee6d5/89508224123.pdfIn PDF document text
- http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/poborenobasogagovewo.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/vipegituxizafo.pdfIn PDF document text
- http://scouttautomotive.com/editor_uploads/system/files/pikaduvozamifaniwusamen.pdfIn PDF document text
- http://bradleyhillsapartments.com/demo/uploads/contents/file/dagumi.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eefebbf0d73d952803bb35c479676a4/lekinadenikiromup.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6161809d30---20671977713.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d4331a1a---2310807606.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ecc82918---59576597756.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0857cfef43e7ad9153bb8d3a76224127/77029285513.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/915eaf9d55de1c39bd6d931b9387a9e6/9950881419.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb425410---15436891992.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6e8eda38ce42160992e79c2e2994ae6a/50536520254.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838db8f3cbc---24266989998.pdfIn PDF document text
- http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/50658499244.pdfIn PDF document text
- http://cosmic-kino.ru/sadm_files/nikesuve.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c38567751973ac45f94ce3409e61b4b3/14599943416.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcc5a1579---vowibixa.pdfIn PDF document text
- http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/34387056962.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_off00018c03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C03	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001a41a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A41A	11128 bytes
SHA-256: `60b11e28b0e2ef25eb602527fce3266312bc48b49d156a255f967562ea04025c`
`font_02_sfnt_off0001bde2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BDE2	18512 bytes
SHA-256: `571d51b6f2aacbd997b5b817150cc547fb90e7aa1ff945e7c29e725fde6b00b9`

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