Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5f7d242778643a…

MALICIOUS

PDF

91.3 KB Created: 2021-07-28 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 88956d450deecb648fd0eac707fbe8ba SHA-1: 1173dca9c1bdf0ce9e3b9582483d1ade401d246a SHA-256: 2d5f7d242778643af6ad02d63c19f2d16199f4e1891d5a39b99e0abf96a6f1c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or SEO poisoning attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://alexandrapanayotou.com/web/images/static/file/julijodidefumiwupuz.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/josedididunafetojejowebem.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e9f051b01dc0d7bb06f8c3282633e7f1/93797286407.pdfIn PDF document text
    • http://www.toptehnik.si/images/38352721533.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/da1527d668d992e33c20d8f793f74118/jebosisifogitebatujudife.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/48539839532.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd42e3c7---vitovifizi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1efa361d1015f1f36a93467966f6cf29/65060849521.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/75646052630.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55dbc0fc6---99833925170.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/sogavunovureru.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/49780603130.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/43d075ab9b5c216ea4182beb6989f241/fexalaf.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tojorevepofaf.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/86474329610.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/sepiforimuxekebazu.pdfIn PDF document text
    • http://armanetti.com/images/78635918678.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/19592711915.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/97844466909.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rejuxutibonudivufurejave.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/919f6bf147186756c4c3d2de8889f0c5/gurofugivonadokonuro.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dab50f47270---velupino.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f79cd1d30---positulezarilinabo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b02f3e170---556799514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fantastic+mr+fox+full+movie+download+in+hindiPDF 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_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 11072 bytes
SHA-256: 6f0f731344a1d3d4eadbe7d4913553d5d1ad8bf28aed8b6ca03f78cef5171bc6
font_02_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 16812 bytes
SHA-256: 0f32b2b6f8f4ba24fb30d87b06f01628f584109f05efd83f4ff144be8d631707