PDF malware analysis — malicious · b5b7a68e81fd9d30

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 05:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 3ccb40099f5e9dd751828d60fa145739 SHA-1: 33075c2af860353e0607df5d95e91ae3a2b15643 SHA-256: b5b7a68e81fd9d30253acdd22fd9f32c9ae55a7e2d2b3d298271f4e005016665

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the document structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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=io+games+like+rust PDF link annotation
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5c053fac2373be7696636155841a911c/5541914949.pdfIn PDF document text
- http://tnslib.tools/userfiles/files/gotawara.pdfIn PDF document text
- https://medtek.vn/storage/file/zegikirotatededujo.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/78799814807.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/92960667629.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d4611978392d8ecd855a6d9f665135f2/48383209890.pdfIn PDF document text
- http://automyjka.pl/automyjka.pl/userfiles/file/mewodimudatevufege.pdfIn PDF document text
- http://jindi2010.com/uploadfile/files/39311936819.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614410d9c9f7c---91258947750.pdfIn PDF document text
- http://findusafranchise.com/files/files/pusejoveb.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2kiaov5ef90er9u5vql5n5nd5u/90787157095.pdfIn PDF document text
- http://thesecurityguardunion.ca/userfiles/files/26457813401.pdfIn PDF document text
- http://goksirkrupskimlyn.pl/img/upload/files/pozijamamewoperiror.pdfIn PDF document text
- https://dcimx.com/files/betomodekitiniviliteke.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/65a7c74c05b13553043c95dd06cdf545/73577024334.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixemogakiguniwekoviki.pdfIn PDF document text
- http://azs-szermierka.pl/zdjecia/fck/file/4839112867.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/32779922317.pdfIn PDF document text
- http://xmzhj.com/UserFiles/file/kisolimikakefusimodir.pdfIn PDF document text
- https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/damalafamonaj.pdfIn PDF document text
- http://archpiudue.com/userfiles/files/80811412095.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/1074219941.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/88367449988.pdfIn PDF document text
- https://textosolutionslinguistiques.com/upload/editor/file/28776918687.pdfIn PDF document text
- http://df-2.de/images/daten/file/34626200667.pdfIn PDF document text
- http://studiopiergentili.it/userfiles/files/rejapa.pdfIn PDF document text
- http://okna-stv.ru/userfiles/files/pisenepizitub.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_off0000b571.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB571	15608 bytes
SHA-256: `779a2da8af3a96a299a0463f37cea77f8122a566741d8855a9b8013f5d067f8c`
`font_01_sfnt_off0000dcad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAD	10488 bytes
SHA-256: `b7989cce70981d447fd2ac142a54e67524439569550992214060de0382af3e48`
`font_02_sfnt_off0000f494.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF494	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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