PDF malware analysis — malicious · e3cb838c5a3b89c9

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 09:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 521dd7c03b1086a9b5fd2b28be14a82f SHA-1: fec652d69e0486c5f13a3973e6edd8b5e9a44820 SHA-256: e3cb838c5a3b89c9f48d6cac6b56fab8f12ebbd3d7042ed02b659562e933df95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=exide+12+volt+battery+charger+manual PDF link annotation
- http://waterlootour.com/FileData/ckfinder/files/20210905_29140F54D20617D9.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf33768b---vesozazu.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bc5faf75c1834a11961210f6e6b4768e/xavejeraba.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f5a05546de---putirupovad.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac51bff2d---wobowaxegipopegisu.pdfIn PDF document text
- https://malashealthcare.com/userfiles/files/bomujolevu.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11b6dd651---kefejemutisezazimeroxoko.pdfIn PDF document text
- http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2413710626.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3cd3d5d5753c07df4ee0bb55b2b1b480/nafetawimolujotokusutem.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8f590f274---mupivulenosura.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d191a898c430ead4f34de1476ae66c87/giteve.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160734e8222dc4---ruvawolokenejewejefajezuf.pdfIn PDF document text
- https://greenvalleykerala.com/ckfinder/userfiles/files/3702188144.pdfIn PDF document text
- http://www.lasallelille.com/admin/ckfinder/userfiles/files/12211696139.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dabedc3bf58---mogixigakuz.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4776567374---davegotos.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/libalusanul.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9f14a325---52290800337.pdfIn PDF document text
- http://monroehighwildcats.com/clients/40160/File/22570897168.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/due83fpfk8ttg4j535a206cal7/pixudugujopuvezibokex.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bdd3038947f934b71fcd5832fb12cd1b/36183901686.pdfIn PDF document text
- https://mabuksusu.com/contents//files/26848141539.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b95af8ddba0---6233304626.pdfIn PDF document text
- http://sartor.ru/upload/files/13497702737.pdfIn PDF document text
- http://king-ber.com/UploadFiles/file/20210622165907605.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_off0000bd2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD2B	11324 bytes
SHA-256: `2dfd41260cc13269f4683f9ccdb2536d4305dbdf2de032b9d1e9f08c05f61ebe`
`font_01_sfnt_off0000d784.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD784	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ef96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF96	15632 bytes
SHA-256: `8b7765e39ef7d75c615863a9b635b8405f7df4e50610c365eb82b22ac81c9cd4`

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