PDF malware analysis — malicious · 3e82143e9fc8e6e4

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 23:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: afc9634e6ae07825bc2a1bb243963035 SHA-1: 1925ebd129c75de5b0efe5cfd11e84077b36dcb1 SHA-256: 3e82143e9fc8e6e486099adbc24a2206a0234aafd9f5aa62a544598d2d3c8fee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of compromised hosting for link distribution is a significant indicator of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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=factors+sums+for+class+4 PDF link annotation
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bjjnfp0ujhgofm6jar8rsn4vk2/fuzuguxogibikegolole.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/30921207782.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/07dc40b7d8722c699b1e9d49a5bc7b57/ditij.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079225b8af8f---sonadanadigevakapisifiro.pdfIn PDF document text
- http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/pidexetekil.pdfIn PDF document text
- http://gasthaus-steinkirchen.de/img/editor/file/86922741697.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/vuwozexigudesifuj.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0d7d9eb8b90cbff3708e9db3f89a4dc2/mekosasewejeguf.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b849dc4b833---gakilufulul.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3kac85k7ns635trfh1etrn39td/fejirixoruf.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8d704ee264540bd84365691fbabf43c4/sezosab.pdfIn PDF document text
- http://alituncer.com/userfiles/file/suzepavedawudizoku.pdfIn PDF document text
- https://muzeumkonstancina.pl/attachments/file/19718782327.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44aa7bf171---guzola.pdfIn PDF document text
- http://magogaralbamoble.com/galeria/files/zoxagixizakememevajenu.pdfIn PDF document text
- http://cariboohose.com/userfiles/file/47629271033.pdfIn PDF document text
- https://drrajanmahtani.com/userfiles/files/10571630135.pdfIn PDF document text
- http://aloeverajuice.cz/files/file/62021716757.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae208dd445b---58483994547.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d301d5f1de---wesidisevexiraxiruki.pdfIn PDF document text
- http://glina-master.ru/admin/ckfinder/userfiles/files/zokadevubolunorawu.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c027614ed41abfffde65d44dbd0e21a0/tesegukijenaf.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777be7d96f4---kupelilavuzi.pdfIn PDF document text
- http://pwr-tech.ru/userfiles/file/68618992053.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45a738919---zegirejub.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/13632751638.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_off0000f57f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF57F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D96	10324 bytes
SHA-256: `75bfb6836d10d0a5b209f87db1cc98ba75060e6487108a2c7636af8605cab134`
`font_02_sfnt_off000124fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124FD	17480 bytes
SHA-256: `a7c4e39698e1fdde356acb62bb499c8fc257cd10db675fc54e42057e36b4d395`

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