PDF malware analysis — malicious · 2d08bac6640be682

MALICIOUS

PDF

89.4 KB Created: 2021-09-09 08:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: acf57bee1ebfe44b04a493391c35e919 SHA-1: 837814f561797a6d622c25cbe261e8471ceeac4a SHA-256: 2d08bac6640be682d1f00926b983515661f7ee74d0ad75a89ffa940f807f81b0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=android+4.0+online+emulator PDF link annotation
- http://blackhorsesc.pl/userfiles/file/genaja.pdfIn PDF document text
- http://yokohama-model.com/userfiles/files/vunalufalokudazapun.pdfIn PDF document text
- http://biemmecommerciale.eu/userfiles/files/99339902591.pdfIn PDF document text
- https://kawanmto.net/contents/files/fukoxoxumoruxomil.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/getunirafev.pdfIn PDF document text
- https://gbp.dropship-online.com/userfiles/files/jujepidiwivekawixerasup.pdfIn PDF document text
- http://dexgerm.com/data/file/userfiles/files/9693298927.pdfIn PDF document text
- https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/seluxewivafajakotirinu.pdfIn PDF document text
- https://sieseam.org/userfiles/files/rojuxubuzuvisef.pdfIn PDF document text
- http://aaronandanthony.com/userfiles/files/81617632506.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161308fca6ff4e---4744443576.pdfIn PDF document text
- https://daotaolaixesontay.com/uploads/file/pavonesetararabaru.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369035ddbd4---65030011826.pdfIn PDF document text
- http://kencert.vn/uploads/image/files/72557977178.pdfIn PDF document text
- http://rothemtour.com/FileData/ckfinder/files/20210903_FF131C6AAF84172C.pdfIn PDF document text
- https://maximatrimony.com/ckfinder/userfiles/files/pumuxabezezewukifitipimen.pdfIn PDF document text
- https://preciseenergygroup.com/media/48524894300.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360b2d17f93---31507445266.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/25533652765.pdfIn PDF document text
- http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdfIn PDF document text
- http://elitakhealing.com/ckfinder/userfiles/files/16088562791.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc35c8bde---gajivikasoderip.pdfIn PDF document text
- http://dd-eng.com/files/files/70650195427.pdfIn PDF document text
- https://yenhuy.vn/upload/files/woduvojediva.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_off0000fa26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA26	17620 bytes
SHA-256: `848561e94886ed7df6cadc47c7f50e7e3b2a1f3f2ad3573dbe64bfcd1c982ff2`
`font_01_sfnt_off0001279e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1279E	10588 bytes
SHA-256: `19ef1e647711446f5b850724778d3133aead3a4f274b1d8cd338a5e378669cce`
`font_02_sfnt_off00013fcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FCD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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