Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6472031623dc5f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 09:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c219c6eccae09e2c67361d6de2b3730f SHA-1: 53d2cce40ce210d161c0f4e29e09b689f25c7063 SHA-256: 2c6472031623dc5fa779abbbb1b021fb665a18c2c85abfedfbef60474fb3a57c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e99c31db---23803825312.pdf In PDF document text
    • http://strandedtattoo.com/file/29456283492.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/1843065446.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/foninivukujoramadizefexaf.pdfIn PDF document text
    • https://virker-ikke.dk/files/40627179389.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba34a8036---wilunab.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/73681344009.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee00d647161c899f31abbeb62591212f/10679076998.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160889509ae2c2---rosew.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/21570470735.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fivubofeworalu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/bijinoru.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099b40d5ca06---begogebaxudepe.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9cb6ff7679c46c40485c9956ec9ef993/safunenidev.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/lelinagonokavenubetizitew.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/wuzivezunozenalokutaf.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/fimaderom.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/sesojemajagisadepo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ef1afc05---46943031082.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lufafivugaki.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i7fobna544ufpolu37tout3r7v/24146965303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+recruit+clash+of+clans+2020PDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 17596 bytes
SHA-256: afa94ff66ee763fc68e9b6fd4fedcddcee133a6dcb3898f74955f1314d3654e7
font_01_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 10852 bytes
SHA-256: 795f604cdddfa8cf76fce621dc0c002547cdde362833a3c5b7597c0b0d8eaff2