Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d9d3b6afe886b…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d580a8b74d4430d826c5b62d07b7bb1d SHA-1: 47be1434fa9cf9b82f6d55d045db293a79b53877 SHA-256: 8a5d9d3b6afe886bf326fed7aa9ad16eb356f9bb4128ef6d2348b7a1de27e45d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe58189177---6483200574.pdf In PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/75272767370.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3rj5bhma90qb02esnk54d38f70/niminutetevuvafaxalawu.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/wuseruvezeluze.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97feb0bcd---83517900160.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2mdckgsljbilq15op3gjtjtjrd/72532893067.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c7820bd8---zemozukipodutebujotaz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d3505aa9---xadugewo.pdfIn PDF document text
    • https://emprenderem.cl/files/zikozefomevipugoguwi.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/wasiwudamesukebesadufu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df6213f914cd9ff1c181122fd2338284/fuxopaxeboko.pdfIn PDF document text
    • http://strandedtattoo.net/file/juxiga.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5kfiiadf5ng5cgafpjqmi21t2e/tolukomawegiduniwuwetab.pdfIn PDF document text
    • http://xtra360.net/campannas/file/30443360310.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1a41a9bfcaf128830ce8673e2ba09d2c/fomorigimokugejususu.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/xabideropowutafiwaliji.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd708885d6f---56967761902.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/49050735655.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/19992405521.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e629c61a---9160989247.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/60889450569.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/megugamifalom.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1223078507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=causes+of+mental+illness+pdfPDF 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_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 18812 bytes
SHA-256: 0e52c32ce7cc1eff7b15544e161aa2d6bfc249f206ac1bcf0648effa5f63082c
font_01_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 10692 bytes
SHA-256: 3b917fc8a733816c1ca3838c6e9a03b444d0042a43326fa4336d761cd54aadfe
font_02_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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