PDF malware analysis — malicious · 3dacfd4f841c265d

MALICIOUS

PDF

85.5 KB Created: 2021-08-31 16:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 63f821b2d1f47db944a14adaf308b39b SHA-1: 130ff72c5adb1b9bfff80180debc39bffefbcc5a SHA-256: 3dacfd4f841c265df7ff225fedee4d8a6ee921cc381fb50a88bb92359deb96b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9929

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://cructi.ru/uplcv?utm_term=cumulative+review+geometry+answers PDF link annotation
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bc08e864027116eaa08b60488abb527d/zonuzomoz.pdfIn PDF document text
- https://marathonroller.com/userfiles/files/razumitod.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9aa30d22790f2798d9ab2a196eff981d/37978818214.pdfIn PDF document text
- http://bsa-billiard.by/images_from_html_editor/file/7514494451.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/nhenjdd64gco0nvp72lop3hb2v/3897205927.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6tl8hqdgue72vfj92fk0pklil1/nupamoxifukuj.pdfIn PDF document text
- http://conomiya.com/images/uploadedimages/file/rapasugej.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/805119c8e901d9c35485eaaf504838d3/89000968821.pdfIn PDF document text
- https://yssnewlessons.org/UserFilesTwo/file/31669422180.pdfIn PDF document text
- https://alatheir.com/atheirwsfiles/file/xunovibaj.pdfIn PDF document text
- http://tutaylamhet.com/storage/ckfinder/files/bivejedimatiruwab.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8ac6bbd29698f39fdb7d224af1dc61b9/neramakaval.pdfIn PDF document text
- http://princeverma.in/uploads/files/wadezuxavolulerob.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6dc7b8d5a---36586155638.pdfIn PDF document text
- http://daehwa.info/uploaded/file/runifuxetajulebuk.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/89f86447b83729f80f3f8463a12d19ff/mirewaxapafojulenafolazug.pdfIn PDF document text
- http://sweatrinserepeat.com/ckfinder/userfiles/files/18582705816.pdfIn PDF document text
- http://nb-magnet.com/upload/files/60138427113.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9ca2d3c3---felobitowuwo.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160898c8c11634---29681024861.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/17901186637.pdfIn PDF document text
- http://hz-karavany.cz/ckfinder/userfiles/files/suzivig.pdfIn PDF document text
- http://roxburyhs1987.com/clients/63080/File/zunitakufo.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ru1679qnv9c6f6ere62c20qjjh/32299470362.pdfIn PDF document text
- https://digireg.pl/upload/fukuxubet.pdfIn PDF document text
- http://abpaluso.com/upload/file/bevebi.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c63d6d1a---ziboredukatifo.pdfIn PDF document text
- http://www.chatanakonci.cz/userfiles/file/57690155951.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_off0000e4ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4CE	18880 bytes
SHA-256: `8e619ad78bb95336eb8d28c4a9db5cdc9790be13afb91bf7ce545d8dcfe940f9`
`font_01_sfnt_off0001164c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1164C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E63	10848 bytes
SHA-256: `9f526f243dc930e7f6594a3b9a4e371f90000316070e26e80ff90f370e890701`

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