PDF malware analysis — malicious · 077a805b3b0daa4b

MALICIOUS

PDF

102.5 KB Created: 2021-10-09 12:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: d4b460ab59693d60043784df0da0c3be SHA-1: a67f3f6edb8273848e4a7aaaf0f720ad1cf4e0d6 SHA-256: 077a805b3b0daa4bb3772e018152a3add5209e139d8235c699d9cdfa34aa4231

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score point towards malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of further malicious content via the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://medvor.ru/uplcv?utm_term=the+haunting+of+hill+house+script+pdf PDF link annotation
- https://hattoco.vn/images/ckeditor/files/1580527684.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/900dbcbc91cf9526e45bb81012e986cf/93225314481.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/lovakofon.pdfIn PDF document text
- https://duragloss.pl/userfiles/file/xakarir.pdfIn PDF document text
- http://kraski-chernila.ru/resources/file/61512849971.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/225db79aa22992b6c3b32464854d5e7a/gaxipazekefere.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jmehr5v9sr1f2ie6urgobvmd93/wuxano.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1dc8dd8e---72548260116.pdfIn PDF document text
- https://ezokniga.com/uploads/file/74294643870.pdfIn PDF document text
- http://cdn.eagle.mn/uploads/userfiles/files/2738920807.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_235239_150.pdfIn PDF document text
- http://citranco.com/users/files/5773537481.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/df0be0a9f57266aaef210cf8d656936a/30035874336.pdfIn PDF document text
- http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/51205884028.pdfIn PDF document text
- https://karolinanowak.com/userfiles/file/lotedewig.pdfIn PDF document text
- http://autobedrijvenindex.nl/images/uploads/41366454215.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/39392093831.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da9feae059---zupolol.pdfIn PDF document text
- https://petandpuppies.com/userfiles/file/36592702932.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/16308903352.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/19527676434.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614200d13bc2d---22217480997.pdfIn PDF document text
- http://medica-brno.com/files/68929040323.pdfIn PDF document text
- http://farmaciacogliate.it/userfiles/files/9740708294.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_off00012666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12666	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013e78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E78	20188 bytes
SHA-256: `628165f2bcdfc3ab8a31ca011531998bdfd136a0d1bbf802b796c5ae48cc817b`
`font_02_sfnt_off00017312.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17312	10960 bytes
SHA-256: `02eaf6d93d71d02c4da10f22777e15af895e9d75edd9eaf32d80009eea34f865`

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