Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0a90c9a1575727…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 08:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c00bb407e1098f36b8506e00d95a153b SHA-1: 678e1ca5894c6a1993d3e7a4fb960827eb8f5d3c SHA-256: 5c0a90c9a157572751a795ca09f8a132f221221635aeecda67c6f88224412d01
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities to execute malicious code. It also features a link farm pointing to compromised CMS uploads, indicating an attempt to host malicious content on legitimate but compromised websites. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3567

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.
  • 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
  • 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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/154661bfb7becbf760def75b3ea82c31/telujedisosijodawazuv.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d8be227e---wezokavizubewizojetifeg.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/65253903369.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/9413461979.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/talopotu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4e945e34---kideloregitel.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/elnctk9u375bqfpo1s3lnh1suh/54116923489.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ae81ebff8e73714f6f501f727b4ac9ff/seduwenenitovawekenufara.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9ac569f9---fovevobowe.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/315c0aab29cbb7f15c804e96ece2c737/pavalekodisobado.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/895d83d1736e2e9d27f440149170c2f0/gowajizinorev.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/4722634611.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jaxivup.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pisedinoneru.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/89852420153.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082794f607f7---nigurubilunanukemirov.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62277d7079---dumugadoneferima.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a162ca15d2---pawipanakaxisele.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/migimekaba.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f58ea1af100b4686bd8a98639b36810e/kemodozafajod.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/musagazevukikomiximu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd4927269---pazunu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a25fd2f497034ea296d4b387a0b2e74a/mekidipapagokazuwavit.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/xexiduleniromibiwujomo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fogibomazugoduzelovaj.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/sipemukakivupilasasop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=navagraha+gayatri+mantra+lyrics+in+tamil+pdfPDF link annotation
    • 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_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 10972 bytes
SHA-256: 6395531b6716c1e319e991902861744aa22fb31a26c9a72b44858b886bf8f55f
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 18684 bytes
SHA-256: 9b7b883155fa329f8c3c35b1fe825ee871905833b5119311a7811cbd5bfc59a1

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