Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a052f8da2c00af4…

MALICIOUS

PDF

96.5 KB Created: 2021-10-06 17:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a2307451e99b425d6943d3c038e53f2f SHA-1: e47a96a5489ef25fbc32bdceee03f21a6c7ca5e2 SHA-256: 9a052f8da2c00af49c769a8307bc7b3e9cdd07e9ecb07a242c55c7c7be094e17
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The embedded URLs and the overall structure indicate an attempt to trick users into downloading further malware, likely disguised as a student book.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://fd-health.com/upload/ckeditor/files/29940808545.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/poxewurolipituxiruf.pdfIn PDF document text
    • http://vodnik48.ru/content/file/besekolibot.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/48348828752.pdfIn PDF document text
    • https://wecareprogram.org/images/file/bavakudozuwivuvifiw.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/rakoduwazotiditokiwobi.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/zilejifi.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lofiwiwamotazizasuru.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/36490000849.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614024e19a10d---57063719790.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/55264010041.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/40454492895.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nakamajibuvamusuluto.pdfIn PDF document text
    • http://cochemical.com/upload/files/kasipokuxajumabutijekex.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/83143788834.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37bcb9c1e---48799918795.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/ruregose.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/gugaxabilaxisikipelupu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/tinuborabosi.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/13244379342.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/pelijurujebikowul.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/7855440750.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/nepilatusifisikekugufod.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/jobotebumovoludaso.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dd22d7a9a---55376242388.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/65301603702.pdfIn PDF document text
    • http://elpijisystem.com/file/rimosor.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/71074434092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solutions+intermediate+student+book+2nd+edition+pdf+downloadPDF 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_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 21896 bytes
SHA-256: df65f7905c148f36ccb2be60e119aa9aeda5e5ab4fe86c6b52ec2eb13b5b312e
font_01_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 11272 bytes
SHA-256: 931045c2c06f9fa0f3d32d0b2dcecf8ff15573b287f2d94be4051530f1a7627a
font_02_sfnt_off00015bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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