Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbdce70c81b5dbf…

MALICIOUS

PDF

81.3 KB Created: 2021-08-15 16:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fdd0991b1f369fc17f534edf34528cf SHA-1: bc127ae170b44c16ac07917f02226ce750eeca91 SHA-256: 8bbdce70c81b5dbfc7a3598ba7f15e5c8cc34e3c0060c4b30f9dc1ee4890cd68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The PDF also contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dfh-consulting.com/userfiles/file/50297705869.pdf In PDF document text
    • https://equator-maritime.com/userfiles/file/gilorifuxusukaneporubelo.pdfIn PDF document text
    • http://school15-tyumen.ru/f/72058047133.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/titewovawonun.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zojuj.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92a2ba87---wokusalosenanujina.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r8s3s9858r88h2c7mu6o3nullr/73029293868.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65a8e520c---wabomuwozim.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/36844394987.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac0d466de---xesanolazizidazapusi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098451db3102---49634117841.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/78409050500.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/49448159792.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/14625611722.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eae5ad6b---46589151361.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/6066734016.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kasajuxosugexomivuwepewek.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21b461d19---jebuxipi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mci35sej603lkoig7bk58ar5nq/95961766171.pdfIn PDF document text
    • https://blokhol.com/upload/files/16974984900.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac3ccee06---pupofadibikur.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/dixezusezebomu.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/14746284178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+a+pickaxe+with+silk+touchPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 10820 bytes
SHA-256: 68c33d12eff840cded1f2984358f70d30c6c4671579ffedb2aa4efd9917676b3
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 16984 bytes
SHA-256: c68d085e6d6c773c79c8aaa3fda977726ca927c40cf8a2efcc13edd38287d0f9
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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