Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c5263bf3dc5e6f…

MALICIOUS

PDF

88.9 KB Created: 2021-07-21 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3ca58d93bc0ce9e35311ff9ca3eb344 SHA-1: fa1ff7d7232261a796bef9f0a007a5155d95362b SHA-256: d6c5263bf3dc5e6f6c6593bd13e76019104122bfe433ef6c239b8c1949403ec3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to file uploads within WordPress plugins, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://scro.ru/pic/file/wagupa.pdf
    • https://bistakalikotenetwork.com/userfiles/file/40230190709.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53bb76d119---topevebuduludez.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/zijulofon.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/032637d7320ff70717c43dc384b59f2f/butarozefawe.pdf
    • https://nabijdefossa.nl/upload/files/56150959386.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c883dee440---8964845593.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a9793bff04797ce4e9f7a6b21c45f241/raxofutemakokupixokop.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869dd4ebad2---terijedejozozodafopolelu.pdf
    • http://dahchen.tw/userfiles/files/92083217647.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/48796636116.pdf
    • https://chpcentre.com/files/file/28595597241.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845aaed57ab---73227525978.pdf
    • http://yomamasushitogo.com/uploads/files/21422388643.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013f75752e---42921676890.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0e18ffe6cea615faf4f4c7bf0cc63b31/rekokezarojirudube.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f017aa8ac12---48647447307.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060933218_989475101.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3c55ace6c96fb62510d94979884b1647/rizofuvuzugemutozu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d38cd30c3---fivewuv.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cf8a4f95---mabinabulejaru.pdf
    • http://brcassociati.com/userfiles/files/puniwaxugufusupog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=if+i+had+one+wish+it+would+be+you
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cd.bin
cf412ff200a324a58df273cb51d8cd3dd8b2d634d182da63b7284b0a8903cace
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 17496 bytes
font_01_sfnt_off00012453.bin
f307b963886e6bb49fab901a4a908d2036a809b97c97faa4bc47ebaac352063e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 10744 bytes
font_02_sfnt_off00013d01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D01 16792 bytes