PDF malware analysis — malicious · 57696db55802cfd9

MALICIOUS

PDF

86.9 KB Created: 2021-08-24 09:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 85f2c67afa163ba0966f5af99298ea1c SHA-1: cfea5a031a010b6a912211dd48b366a5940f9f73 SHA-256: 57696db55802cfd94debaa5bc9e5edadf51645d8f25049c6ac178b585e058ef3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'Urgency / deadline lure' heuristic further support a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://coretry.ru/uplcv?utm_term=grade+11+algebra+questions+and+answers+pdf PDF link annotation
- http://ainut.fi/userfiles/file/piveborewetakiwijegat.pdfIn PDF document text
- http://turagent007.ru/userfiles/file/kexotasapul.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fb27794156e8d362ad8e7a18ebe5a349/9139935195.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9d440c2d7bdae89e7d6836c4c355f4b0/vurejutalefovefa.pdfIn PDF document text
- http://autowagon.it/userfiles/files/76437428596.pdfIn PDF document text
- http://ya-ke.cn/admin/upload/14667683893.pdfIn PDF document text
- http://giasuminhtam.com/Images_upload/files/44263481766.pdfIn PDF document text
- http://wanyuantemple.tw/userfiles/file/relilafob.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba57fd00ab---fidoge.pdfIn PDF document text
- http://tsradviseurs.nl/mailing/images/photo/file/2558858940.pdfIn PDF document text
- http://tortsurprise.ru/upload/redactor/files/98981299881.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3fcb363f9d9070eb1de02f454a79154c/51613171570.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/mezovaxanufenekobilenurug.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/i5s1195tbijo3gp0d136td6408/zadekonizaxuve.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c5d71588428c39a4a029a829bf943220/4629081105.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/munsn8b2ofm7msg5n0jpo6sft6/28567590633.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d769680f5---80477422176.pdfIn PDF document text
- http://qazaqbanki.kz/data/content/files/25530503646.pdfIn PDF document text
- https://angel-juicer.com/FileData/ckfinder/files/20210701_D6834B55BADB457D.pdfIn PDF document text
- http://hyundai-baoloc.com/luutru/files/funafixelilalib.pdfIn PDF document text
- http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v496ht8b0nt6k5doij4q4gr8k5/11057562145.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d33cda6d5ed---nubogotinelum.pdfIn PDF document text
- http://mmckno2010.zkosuchdol.info/files/fiwudot.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0cf8d284e0f6e6d1306f8846572bb7c3/61387300008.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f757fba81492f154dca4b1547efe03af/narolejaret.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_off0000ed44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED44	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001055b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1055B	11236 bytes
SHA-256: `7e0779ebe2bb1cda8021ee2bf52201cfb29d4d56fe0e6bac1fb4470d24c91ae6`
`font_02_sfnt_off00011f25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F25	17420 bytes
SHA-256: `29534959de38ddae9d19c41ee6e771d30e0d2b9949ba011c7f4d139de8c6169e`

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