Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0b13c7f0ae98a5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 03:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 020e47e00a4d899a147ea95557ab13aa SHA-1: a00276352479d102339c12344162e53e6b1f504e SHA-256: 3a0b13c7f0ae98a50cb9b71f726c0bdd4b9a7f93babe75db077d947732c4ae3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://go-pxl.com/uploads/files/53089164529.pdf In PDF document text
    • http://ihdbd.org/upload/files/mijekatotati.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/80338715317.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/95784970396.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lisewijuwidotizari.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132062ba973c---lazosivunelow.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906054427.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/66892363319.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s0i6fo9vo3im074bfukpt8ocr6/fovisopo.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/29104153088.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/deziko.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lizupebajijikasago.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wakoraxatu.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/10055117987.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae43bebae---69217548693.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/11150096581.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/28597577928.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/givatodupaketowa.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/43834875112.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/rusotumifozuxanadubiz.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/57073045063.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/99953669800.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/tosilagig.pdfIn PDF document text
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/beniwural.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+parking+carPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 17592 bytes
SHA-256: 767845cb8844f7f48491a97e82b88d8e579d0971ed1ab0c5196328f9d5c90353
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 10056 bytes
SHA-256: 8515483ce7a492e3be0d9ce4bc577cd20544e3a858d67e59650f983f322409be

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