PDF malware analysis — malicious · 875ab0d7377dc9cf

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 12:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 72d31c16be81bacde9c4f23619618223 SHA-1: 7a632f915d716135f1f356fc753f312938966de0 SHA-256: 875ab0d7377dc9cf03a807492c9c4b0ed47221979caeb1e04f9b9a3374f44782

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

The file was detected by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS upload storage, and a critical heuristic flags an instruction to disable security software. The ML classifier also flagged the PDF as malicious with high confidence. These findings suggest the document is designed to bypass security measures and lure the user to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://philabc.ru/uplcv?utm_term=hard+app+lock PDF link annotation
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90cc8a25---35648379943.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/66736464909.pdfIn PDF document text
- http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/62637947411.pdfIn PDF document text
- http://tznjl.com/userfiles/files/kisokepowepewukusaguzuzu.pdfIn PDF document text
- https://elger.cz/fckphotos/file/41560722440.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5af5ae9abc1382a0af9e42c0c540638a/nojifulok.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c13eca74---fegixakolizawibojif.pdfIn PDF document text
- https://ahha.az/userfiles/file/9419144818.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f0f6bc26---17780452416.pdfIn PDF document text
- https://unitytradefze.com/ckfinder/userfiles/files/84832359583.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbf748594---mepukaxubeloku.pdfIn PDF document text
- http://ankamet.com/userfiles/file/80233628001.pdfIn PDF document text
- http://crediramasrl.it/public/file/75944155082.pdfIn PDF document text
- http://clinicaveterinariamontecchia.com/userfiles/files/livelofazudab.pdfIn PDF document text
- https://lrsdev.com/userfiles/file/82433591646.pdfIn PDF document text
- http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/dajiwilafebunivegata.pdfIn PDF document text
- https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3deb5e53a2899b7a031dad9251b6af29/88336696154.pdfIn PDF document text
- https://gsm.company/ckfinder/userfiles/files/wabewifikobetuzexabawore.pdfIn PDF document text
- http://daithanhnam.com/upload/files/43035213398.pdfIn PDF document text
- http://thucphamchucnangmy.vn/uploads/files/66377656018.pdfIn PDF document text
- http://flyingwedge.com/uploads/assets/file/bujavubolakavufowu.pdfIn PDF document text
- http://www.saaegfpolis.org.br/ckfinder/userfiles/files/vakemevezozogev.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_off0000da96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA96	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f2ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2AC	9996 bytes
SHA-256: `bdaa9eba8226165b556d7ad9d06857c8d38f5308a1236dd4d0adeb52d4d2a1dd`
`font_02_sfnt_off000108d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D7	17556 bytes
SHA-256: `f1edb25e61b5ec11b8026c8f0036448ccee9bfb79663465fbf97b498f827b8be`

Open this report in the interactive analyzer, or submit your own file for analysis.