Malicious PDF — malware analysis report

Static analysis result for SHA-256 7671a5b8add12cf3…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8527f024418c38323b71c31f1549a96c SHA-1: 87079098b0df1910e0e730ca2b857658077d3897 SHA-256: 7671a5b8add12cf3d6e940a4f7bc825232fb0c476abca7fbff54a96213d93759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish users. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hglobaltour.com/FileData/ckfinder/files/20210613_1DD069ED94EAFE4C.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3qrfp00ampekgqbb7u0umg2kpl/moloxokavisejoloruvogi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/86a870a1898e121d3dbf0754e8ae3a8c/5037415918.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5d1631b---kazasuvapujedasipuz.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jojabufurejeta.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g816tiln7l66114vrejls4l4uj/87404159909.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/obt1nrd415nmp6ogs39lp8rp40/kalopifegezeju.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ffc4d66f922d96d8a9f0215aff1f9341/jakenadebibatol.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c21addef---28789732888.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bejud.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/spbp53domnu8oke44fbt9mq1n9/regetanizabutolekazasup.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/3181085693.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097f1cc80a---jadatawu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/046250a5511c33e13bc7bbb43319f973/tadogusuna.pdfIn PDF document text
    • https://senhewood.com/d/files/99306690151.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a350c27c---19773281382.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e4deb3c53d9c59bb1e33a562d5358603/fizinijumojanako.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5al3dr9rvkdov4pr8hmikbdpas/nixazilonik.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mulirexaxelurewelutevipup.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vvqdnq83ip06oacavr14oifnf3/93578061966.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c363dc8f9---jonakoz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vcvd252t6l4fau9gdvh7qnmuk0/moxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+build+a+elevator+in+minecraft+easyPDF 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11132 bytes
SHA-256: be10706b815375ffca01abdf7adaca5de55f867733d74b20f2741acee56c2564
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 17120 bytes
SHA-256: 4391a75a32a3e30c5b8fa1047ba42b7591de97b463f59da865fe79d435c91907

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