PDF malware analysis — malicious · 311335e22bde2c1b

MALICIOUS

PDF

83.3 KB Created: 2021-07-07 07:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 13fd0df51ff40d6f9decd86da21b423b SHA-1: a3630f30fdfc0dcb55de019ba95de69debfe3175 SHA-256: 311335e22bde2c1b6afa405cd35619dfa4fedd358cf246ef3c212388455e7646

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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 http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/bexetavevaguxob.pdf In PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/f0sk3m24uf2tdrrovh0bln0mc4/joxoja.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rloeqcuerl29dhoku4js1lsv15/visojifumusiluxewitujane.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4bec23b9554f5c37e71f72c757535300/90365912534.pdfIn PDF document text
- http://pc75.net/upfiles/file/1622245409.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e0f695cb51860561300d744273b9bf08/22224686746.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/dfb314f3d8b90ea4ac3ab0379209acc6/retiwafisuzo.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9a8804113d32a36f871a6d236e5693f3/mivedagelorire.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6165e3665e---80660165966.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde0338427d---4386706021.pdfIn PDF document text
- https://coil.hk/upload/files/11697221751.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/vg276f8k9cerutc1er8o6n2088/39859622460.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a90c62254---sufani.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/laraminobuxizad.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/907148a4ff1461aa61ea865a40badd47/ragowirolufegejedezovo.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c6989ba4a57---bigive.pdfIn PDF document text
- http://yuanyoujie.vip/userfiles/file/8132922333.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d36016670---geloxozimen.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160769f74d40a5---vepatozubore.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=couscous+in+englishPDF 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_off0000e6b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6B9	10280 bytes
SHA-256: `19ea0ccba9319fff0fe077af88cad5bd15daaa2f3f50c7dca27b984c53996783`
`font_01_sfnt_off0000fdc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDC8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000115da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115DA	16472 bytes
SHA-256: `6fc1558acadfa1060f189ab99a0157a3754e7daafca86ebc12f558dfa49315d8`

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