PDF malware analysis — malicious · dc9725c625d855dc

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 13:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 869a352e176c077851e433396da1745f SHA-1: 8ef5558d904353b7f11d8b410c3549abcb24a620 SHA-256: dc9725c625d855dcdef2d5f3b90a39a674292fc17e9c100c0e81c2e5e8ca2e6a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://jungleflightchiangmai.com/Uploads/files/kisipomusavuferefinoxoji.pdf In PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd459510d5---20809939113.pdfIn PDF document text
- http://mamitobe.ru/files/file/zakuluferumixifeluxanep.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8905683f5d37eb9212225ebe242e0825/zogekorexopawutorez.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wamiwadu.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/47677138014.pdfIn PDF document text
- http://paintmaster.hu/js/ckfinder/userfiles/files/76123013439.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9b9e68f94---ridirerukomewuwa.pdfIn PDF document text
- https://justbuymeds.net/userfiles/file/nagimomosox.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098716fda508---1610172260.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9542630b83---96178594889.pdfIn PDF document text
- https://krzczonowice.pl/gfx/file/94297362035.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d577028bbb---xubupajoj.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dacb59b6be8---98237299963.pdfIn PDF document text
- http://www.siscbolivia.com/admin/uploaded/fck/file/44725746020.pdfIn PDF document text
- http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/kakubifejulebu.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/20855465c98a95708da8babf4bfa81ed/wodibazafanulu.pdfIn PDF document text
- https://derey.nl/app/webroot/files/userfiles/files/sexuzozewurib.pdfIn PDF document text
- http://awkontrakt.pl/ckfinder/userfiles/files/metilumesusa.pdfIn PDF document text
- http://canigrup.com/userfiles/file/8181795099.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/da6b2d8213893d5c59b753f8837d1c58/4639631961.pdfIn PDF document text
- http://sgo-bage.com/public/files/files/19316251693.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6c6f995361b689a344caaae3d509b8c4/xizod.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02ecae104---fapagogusodude.pdfIn PDF document text
- http://cathayred-csr.com/img-cathay/files/43586658706.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=coordination+compounds+important+questions+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_off0000e193.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE193	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9A5	18204 bytes
SHA-256: `4b54b6a7f98e41dbddfdf8ade3fef58fe17c030230e4edfaeb60c2c728bf5750`
`font_02_sfnt_off00012761.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12761	11012 bytes
SHA-256: `e4e5b994dd088672567dd926a30277d3f21ff541ca64be9f9b6b762aaaaa430d`

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