PDF malware analysis — malicious · 6f2c4cdb3ae92413

MALICIOUS

PDF

90.6 KB Created: 2021-08-02 07:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: bc026fa1c232867d148285052750e2ee SHA-1: cb3fed80da9fd1c42bf1e8bdc10dbc618430f682 SHA-256: 6f2c4cdb3ae92413992ffbca2a24706037f147c89277f64bc504ea825f344c63

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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 http://apcmagon.com/userfiles/ledud.pdf In PDF document text
- http://vandientuchinhhang.com/upload/files/93780573919.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df96afb0c0d---vefafoxunivazu.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f36dad21b2715933324724fa5e65e258/jugurinadafuvodezonujel.pdfIn PDF document text
- http://klpa.net/userData/board/file/2685836509.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d08d5d59---64856499829.pdfIn PDF document text
- https://kaptenhoki.com/contents//files/46036033180.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/43fc877740d85f500bad4bace4089bef/tetujejovorikixidet.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1be09c679---73917777155.pdfIn PDF document text
- http://fsanaq.com/upload/file/210617060734691949b7us5jh4e61x.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f468d833a---43733078478.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/newonabuxakejubemoti.pdfIn PDF document text
- http://madmojo.com/fckupload/file/17764089254.pdfIn PDF document text
- http://dahchen.tw/userfiles/file/87278789887.pdfIn PDF document text
- http://garderoba.sk/images/_file/bosijuzave.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608617c78b4e5---95487034549.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be43cd356ad---vexuli.pdfIn PDF document text
- http://arohitourandtravels.com/userfiles/file/jilazudofuxijim.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0375e925---88576315657.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/pugafexepiwisozem.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e502b158---79385343634.pdfIn PDF document text
- https://birudongker.com/contents//files/tomujameleponozu.pdfIn PDF document text
- https://castilloexterior.es/ckfinder/userfiles/files/27345975082.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vean5sm02k77qo84bnm1v1c9em/23895169467.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c46fobmk7utmmb7fcj2q07g491/95443436519.pdfIn PDF document text
- https://scanclean.bg/upload/ckfinder/files/26808285809.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=daily+reading+comprehension+grade+4+pdf+answer+keyPDF 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_off0000faa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000112bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112BF	11340 bytes
SHA-256: `3d687c9c7b781edcd1104fa6adcabe003618ba14c47444caac57ed5df3139809`
`font_02_sfnt_off00012d16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D16	18036 bytes
SHA-256: `fefe823541e3ea5ad88de4a10adcb4b3640cd9cabc8741d306989f3230c3b430`

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