PDF malware analysis — malicious · f94f3ddcda325994

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 15:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b8399e06bb78e11f35106c05900fe38f SHA-1: 5cba70c131458f4368c9eee6cb288384e8bb4c77 SHA-256: f94f3ddcda32599439d5576cb052457a0c810eaadec5f7d76acc63c46dbf5580

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains, likely to obscure the ultimate destination. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://sxcec.org/userfiles/file/xiboru.pdf In PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42491cf2---97373212206.pdfIn PDF document text
- http://dnt-mayak.ru/content/File/jesejubovofis.pdfIn PDF document text
- https://buka.ru/sadm_files/77649195800.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/876fc912b30937d433807a391c779aa9/58045783158.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/tujazufavefuzakikuv.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bad9e4aada---41546603132.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777d61dbcf---56947381259.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
- http://www.fashiongale.ro/userfiles/files/9902480550.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/28fc75d485e1e10efb54e57e396cd76f/gewaxubavo.pdfIn PDF document text
- http://cualuoiskydoor.com/webroot/img/files/21853546898.pdfIn PDF document text
- http://travelshops.pl/userfiles/file/14483501656.pdfIn PDF document text
- http://allnatureint.com/userfiles/file/pulavi.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f8d9b621---tomogixufix.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6i4h83rl13f2h827b8bvhrtaeq/forujekolupozutowatufuro.pdfIn PDF document text
- http://ngocvietbungalow.com/upload/files/neputonawekopapajamire.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d31f40400---19356504487.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a3d38e401db75a0f079997d71ef19e61/8541916993.pdfIn PDF document text
- https://derfo.info/resimler/files/jejusi.pdfIn PDF document text
- http://razaviota.ir/basefile/razaviotair/files/21608769483.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c3abde493dfe277a5ac7a4a3f6bc7dd3/fowupevikov.pdfIn PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3896c7d448704dd70fd59a7f8a66ac47/87605652752.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ffd1e71---kusuvaserumubep.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/gikusesuluwaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=physiologie+appareil+respiratoire+pdfPDF 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_off0000dadb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDADB	19780 bytes
SHA-256: `959a01629025b8caeaa0be05430f4f99e86cba9b7f33a51d9d5a3c11532c1baf`
`font_01_sfnt_off00010ace.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ACE	10788 bytes
SHA-256: `2095aed41cffea3d4543d7ecbe69c6987fe0e4bf5dd76784f5994c747efa6136`
`font_02_sfnt_off000123a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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