Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0bf8cf53d68621…

MALICIOUS

PDF

99.2 KB Created: 2021-07-24 23:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d97f849fd8170b53d113165bad5c59e SHA-1: dcfbe279c5a09bda7deaa1f0d843cd8ff4b59cca SHA-256: ac0bf8cf53d68621c3a047a4b64845becc65a78de344483cebdddcd9c37f8ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate a link farm on disposable hosting and a high ML score for maliciousness, corroborated by ClamAV detection as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of multiple links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://facades-et-traditions.com/actualites/file/12579622435.pdf In PDF document text
    • http://interstroy96.ru/uploads/files/xuvizanorobekuzesuluzeb.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/56da6k62ng7f754qu3omcr9uaq/galawa.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/wawusafobojumagilinu.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/wemizabenixolemusixewok.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d83377786fb3d41f65eaaf399fd012a8/32771989503.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/37458818864.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/berigaboxexufo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/duganexunafezapafixore.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/8803469888.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8724cdeec---56297104402.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d1179e44b97890b1f562543d138ad1c/41876118065.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb495988a9---sexakufoxag.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f43c57da---bakelopupegokixelavemofu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pemediwatazitipijeronu.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/jeludexep.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713042242.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/6582077442.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4906af07798227c15d97286938754db6/savaganosapadidexew.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mitewubofujosuferera.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41921903647.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/37024456430.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/593b97b48c8d71740ccd67b674c8788f/8492837477.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc532b3c83---damakudosavixole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=comment+installer+whatsapp+sur+mon+iphone+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 10868 bytes
SHA-256: 52f9be68429a218f40ce698fddb22f80c2981f1d6fe5dc3f33d7f0f22be7cacf
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16080 bytes
SHA-256: d9b8130aa6f9633ab3de79ff31e2004108ab7689d1c7a99745aef320e0a208db
font_03_sfnt_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 19152 bytes
SHA-256: cc14c04ac4a065665a119fe589c155b4b8dd8e12c82051a4f3df547b86b4dc7c

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