PDF malware analysis — malicious · 1759ec57e16edbbd

MALICIOUS

PDF

87.6 KB Created: 2021-08-09 21:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3ee2d1fd49742064cfd906d0f48e61c2 SHA-1: a6e2e6c47679f499947d1da55cc57af2058f2a0c SHA-256: 1759ec57e16edbbddc2c0f64706ae32f06ab79ed0f885405f7780924f3171919

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=applied+anatomy+and+physiology+a+case+study+approach PDF link annotation
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0cb112ee3a6b64389dc84dc0f8380727/21394059090.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d41da0afb6a5d95c46aac9178a77b679/82827623686.pdfIn PDF document text
- http://jkohut.pl/file/67783084634.pdfIn PDF document text
- http://amadpich.com/userfiles/file/30903133809.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f2671b922c4a0b1c6c4c6b0f037f0201/71513757971.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/585fddfa42d8e7d911a81a465d375fdf/nagejejul.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c586fdcd---taxamuze.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/49savaucebs4p6vk3eb2cghmdm/biwox.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/xikedimi.pdfIn PDF document text
- http://isgsrl.it/images/file/61715035340.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c7d16da8dac5fe7aea36627cd508ea1b/99096331619.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/43436275648.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c6cdacc58a8dde12342af5e9451c346/93965147447.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5d8l622ad28c3kjdbrpdfcus5l/xobaza.pdfIn PDF document text
- https://tavio.ru/files/file/96540867347.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3ko8qmv0duu3rp1pg922gpbgq8/noruvuvigejovonopilut.pdfIn PDF document text
- http://asianaccounting.com/admin/fckeditor/userfiles/file/39709110869.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc9d1d79e1d241d8cc657dcafc16a7e6/woxedevoledazipuluwa.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///pufimod.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bedf099f---winixowonalugag.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac63e7ba8---majaxukuzob.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919736698a9---4439509700.pdfIn PDF document text
- http://conganbacgiang.vn/app/webroot/uploads/files/31422713066.pdfIn PDF document text
- http://consade.com/userfiles/file/bomigakor.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9fc438ea2efd330db8b4f108d46d505e/puranatefako.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_off0000ef28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF28	17176 bytes
SHA-256: `6db29a6a97ae7e8c4dd453e89b88272635645f072249ef9d96e56adf8bb7a0bf`
`font_01_sfnt_off00011c3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013455.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13455	11156 bytes
SHA-256: `cb149532369efe582f7ca18535214d6941fd7bbf3b84abd2694fa02ed99454e7`

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