PDF malware analysis — malicious · 735af7d429d88524

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 23:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1713c0346fb748de2db8c7182219245a SHA-1: b9d1b2e1b45a13564f1ba1b96128236ad6680496 SHA-256: 735af7d429d88524bc75436180296384591939bd62c478c5e5dc513f4c49b2e6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 5

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://ketchas.ru/uplcv?utm_term=class+10+geography+all+chapter+notes PDF link annotation
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/83320528730.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13c189c55---wubaratunofubudiramaluk.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r6mpgk8i120cobuuh25mla66u3/56103676792.pdfIn PDF document text
- http://khacdautron.com/Images_upload/files/pazubipago.pdfIn PDF document text
- http://come2menorca.com/images/file/63004919144.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/18591e6649f2c306068800fdd107547b/vaxerovejapobujanake.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ahsfd9k653p3lems0jtm5augsj/mimin.pdfIn PDF document text
- https://umutisi.com/umut/upload/files/tezet.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160891bd04affc---fomosarudupedojufofabu.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/77929047305.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/034b9a3b29412c5fababa6ab75dd833f/lujexotatogok.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaed601c6c---89921169323.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608764ba10646---pupokavaluta.pdfIn PDF document text
- http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zesodonanematosejewiz.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16091f20263075---folovukoladojoga.pdfIn PDF document text
- http://www.egavilanes.com/ckfinder/userfiles/files/vimotavu.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/66733179859.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/pirolifapizu.pdfIn PDF document text
- https://majubesar.org/contents//files/47858759240.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bfa3bd077d6daf36a4fc483eb90b4e4f/14828226400.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/86b6c235ad3bf426544bb0b2b5757697/bexavajezol.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/73632130707d99ba1462d55f0db31a4f/surisuteronavosavina.pdfIn PDF document text
- http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45224414309.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/50367539172.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_off0000cf39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e750.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE750	10880 bytes
SHA-256: `49f715e0674fad88dd79d292ecd53707ac2775dcca51188c2bd0f547d8c9ac5e`
`font_02_sfnt_off00010088.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10088	17588 bytes
SHA-256: `8f6d432fcde7e1d82d72fda9f9006f57eb042d7712a1104c9cb2261a02f6a728`

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