PDF malware analysis — malicious · 8e1c7e60fa7effd1

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 19:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b8cea9029ee4e6824bdb6007efb6a550 SHA-1: 658d95d70b0ada684e7607d296ccddd6b18e77c2 SHA-256: 8e1c7e60fa7effd1763e6eaab87dd3aebbe99e56fdd5b0aef59ba772587e1fe3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. These links likely serve as a lure to phishing pages or further malicious content, consistent with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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=doctor+who+series+7 PDF link annotation
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1f583014---33738809153.pdfIn PDF document text
- https://tempatpasang.com/contents/files/bafolopegul.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485f16b2f2f---43708318698.pdfIn PDF document text
- https://tavio.ru/files/file/jejurutinazofiduxixopazuj.pdfIn PDF document text
- http://retrofitoman.com/ckfinder/userfiles/files/nafojajamilusiw.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141379e22c96---bijuseteranokudo.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/tilenexipogosokeku.pdfIn PDF document text
- https://nutstudio.it/userfiles/file/biziliwofatavewus.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952666a698---59222271192.pdfIn PDF document text
- http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/tumatomevimimukonuja.pdfIn PDF document text
- http://philboyd.com/vivudiziji.pdfIn PDF document text
- https://rintrans.com/files/sekarexujopikagudexum.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377c22963d9---18523378654.pdfIn PDF document text
- http://kaushalacademy.org/ckfinder/userfiles/files/difupimobekavalerus.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/2589620761.pdfIn PDF document text
- https://acrgroup.nl/userfiles/file/15879436458.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/xiwixejexalunobowibok.pdfIn PDF document text
- http://jobsandhi.com/uploaded_files/userfiles/files/lofez.pdfIn PDF document text
- http://signauction.net/userfiles/file/xixegesejuvodipi.pdfIn PDF document text
- http://kondicionery-dolgoprudny.ru/upload_picture/file/71581055059.pdfIn PDF document text
- http://fzcce.com/aimgs/uload/files/54846851913.pdfIn PDF document text
- https://ixiu-23.com/uploads/files/202109042337428037.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0b56b314ffe41c5bf4036632bc0a56e2/najesusivojalovezuf.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd95d2739---72315900918.pdfIn PDF document text
- https://kibledergisi.net/resimler/files/rexabodunafojibaperup.pdfIn PDF document text
- https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/dunagun.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_off0000e46d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE46D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC7F	18108 bytes
SHA-256: `abc31c32bd06beef7f39d2da948c43c12885a2a43dcd15723de1983e6f1f8605`
`font_02_sfnt_off00012aa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AA3	10152 bytes
SHA-256: `0560a76d5623d1a4f1a54889b2d5b08403a894044d1d3a34d776823479e0a696`

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