Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dd967423bff713…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 04:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1f33b52b97f29b96a4e34121e5f8757 SHA-1: 9550d5c7fca0d0b1721608d40f481fe2b445e1e2 SHA-256: 19dd967423bff7135bf1ee52d4b8a477e6199b5b31b5fa3b3d823c3e06b228f9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiopignotti.it/userfiles/files/49788564568.pdf In PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/60853387699.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300a6deb4e6---29868567110.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/52500118561.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/fitofupamaxiz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kjtrel1ermtrk5nebm2bb50t27/28277878061.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/tapelukuf.pdfIn PDF document text
    • http://askort.pl/Upload/file/20850112136.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nenagitarigokadis.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132d13817946---2589451319.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb01643b42---29240353053.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/zefejebazutuwokojawubo.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/22136823503.pdfIn PDF document text
    • https://tckontrola.hr/files/menibogatova.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f24a5e4f230179338552c61e5edb5475/31117785585.pdfIn PDF document text
    • http://jcpingie.be/public/files/poxofalesivonotafij.pdfIn PDF document text
    • http://ministerium.pt/files/ruwameferapasava.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/96290444096.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37618026161.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d3da9fa7cf89c451b6f3c58e923d809/fuvopawoserugum.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147413f128a9---ridijotewike.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/tujoke.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/fegutozij.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/97146224297.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/74062628869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+setup+without+wifiPDF 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 10556 bytes
SHA-256: 7297ebdae62362fffbdaf6339880e7b9cfe6c6fef0324e1b37104cedbfb40d3b
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17608 bytes
SHA-256: 0653359d0ab16881cd1912dc70b95938cfb3b8bb50037ae4a3d51bd9fb79b2ff
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1