Malicious PDF — malware analysis report

Static analysis result for SHA-256 915ab48dfc85d4ee…

MALICIOUS

PDF

87.0 KB Created: 2021-08-13 13:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f9154df86bdc1e9e6d17125a7f012af SHA-1: d548e5f8301c7b8ade66cf1752e6d680955f8acc SHA-256: 915ab48dfc85d4ee9bc9eeb9c82b96a91e8a0da1f582a661b255117d9c50a917
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/23rquqbnsijcq4uphk9lhbpq1j/vujifowokufoketadagexuban.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/91564177561.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/57540925632.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ef2ee9cf6fb9fa9a13d7c07602b00860/samepojusipinadikaju.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/xuson.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fadozigisonaduxanibanabu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b581fc6f8cc65a10f22206a1de17863a/69218822404.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mpk51mlde0gkbqroihequ5jnf3/52590157213.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/suxinujoluxit.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0cc57eae9396c64014a719dbb0d940ed/siwumebererifafoxa.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/8648887846.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zamewebelawoxexewufibuxaf.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/787aea9686d0738740404666d7b9373a/puxedepuzuvipibidejut.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jizovisize.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/sopamikaredaralafe.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-28/20210628131909757164.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5420a2030d---famukigujuj.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gegalupokugowowine.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f66dbdb3---gijujazitax.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/58843c38a946f841b00df885c6bf6581/xaxaf.pdfIn PDF document text
    • http://hidropro.hu/upload/bikenifukakuzaxef.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/numifev.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/27493999445.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e33510bcd37541408f16a8467ec29cf7/xekewomopoxitodenonudupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bohemian+rhapsody+piano+sheet+music+robloxPDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 17612 bytes
SHA-256: 088f526eb6245ed71c91e4e89867ef98f8e222a5b8f6db8d112bf478ebb49857
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 11288 bytes
SHA-256: 46df6b66d0facf4e64012c2871ca6ad92074e8a634e7ee82d0059d1337735bb7
font_02_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1