Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c2e8f2c360207a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-06 21:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7123e73a35e216e06c9adf357dac47bb SHA-1: 258e88086f2cebc4d30b57d747e18c31e953ad57 SHA-256: a0c2e8f2c360207adb7a0759554d6120da0d21a7591bab8f2fbecab023930770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these link farms. The document body is heavily obfuscated and appears to be junk data, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d82b3e3b32---zulegolodebarewapesoze.pdf In PDF document text
    • http://ashokarefrigeration.com/userfiles/file/34416488164.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/36867067269.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/nisilaxanopaxewini.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/doxezolagebugabamividu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/13826196832.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kedipawefezuxo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a5a515a02---nalir.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a41f30b2424697f9fcc7a7aa82f861ed/17830595601.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/62217102297.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/gemesumilibizubovutiri.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/nuriwemajutigatogege.pdfIn PDF document text
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/86148717660.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/9275702341.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/62852588487.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210824053115.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/famemewunuzutipi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cbd1ad4ee0b2b6fdefb51828a766418e/13012174237.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/kujujuresosi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/28944055287.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5e953534a---74677214129.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f502a265d00---nabanivuvo.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210514060734.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dc7118fbb9094a8c2c4f9d048b698b7b/gunovakavilubupomelezoke.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087475046585---39203008139.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/xogamibeseviro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=classification+of+plants+kingdom+pdfPDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000b85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85B 15320 bytes
SHA-256: 59c79f5a1d909cda3cb6dd2c6a69a4173223161c390bb39b2fb9b62b699260d0
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 10852 bytes
SHA-256: add12c441e1c0b5ffd5cac5706eea550ca42207595446d656a895c3aa5a1771a
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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