PDF malware analysis — malicious · 7ddf0d57880f1e7a

MALICIOUS

PDF

97.8 KB Created: 2021-08-20 21:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e50c1ff9f62a52636cfa7e355a99a4fd SHA-1: e4208a585d6c4f9cdbd9fd5bbcb2b62213e1db9c SHA-256: 7ddf0d57880f1e7a90a0dbc367d316e5b4404e57e1326142c574a6932f4d8eb3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's purpose is to redirect users through a network of sites. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or SEO manipulation attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

Heuristics 6

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.
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://pistant.ru/uplcv?utm_term=merchant+of+venice+icse+book+pdf+download PDF link annotation
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ffd3b4a61bbe2c5bdac98a7054cc761c/77844579365.pdfIn PDF document text
- http://umiyawoodworks.com/fckdb/userfiles/file/dokefefunupenematoz.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/smvjs2t2b333qqnpr64msbtk3e/dodogo.pdfIn PDF document text
- http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524532b487---75449378756.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e592262e43c8effb49f7b0eb94a0f03/24294278915.pdfIn PDF document text
- http://tysons-cafe.com/uploads/files/diregemub.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/58277779571.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81a7d251---kobalanovidikib.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/wenugoz.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731ced64462---25503300027.pdfIn PDF document text
- http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/maneguwu.pdfIn PDF document text
- http://africalegal.nl/userfiles/file/dijowu.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0cdb9a701---rulopisuguketujibi.pdfIn PDF document text
- http://namngonviet.vn/user-/files/dutamufukawikezobogakanu.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea8190045---sejomota.pdfIn PDF document text
- http://leadingedgecorporate.com/user_images/file/retidibufagibumolu.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783652e61fb---12304449288.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/75522245536.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/fedejawukodubuw.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088d05e9e3da---3634152036.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cc90a57175240e262a58cac0599954ed/68820434870.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d7506032655b73fee1a09cfd3193ccb3/5335412030.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/367a9939cdf8946bb2a017e5314bef5a/56215564071.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089022c3d93b---7571558165.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ee270de7431271950a55cd17b08957d5/zovotigilalutukovatefew.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/21639710819.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_off000119d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119D9	17188 bytes
SHA-256: `470f6e333bf50307c37328301bba10d6967d14a2f24035dbac7786fb4be9e0a7`
`font_01_sfnt_off0001460a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1460A	11092 bytes
SHA-256: `7ffed17b287b8ec742289b492e794dce2074b61d92a028c30679756aae976884`
`font_02_sfnt_off00015fb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15FB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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