Malicious PDF — malware analysis report

Static analysis result for SHA-256 71571a0ebc92ffb8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 11:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c0d5f9d41ed6459e3c5a2138bcae75b SHA-1: 0e2ed256d7329bdff40983740604189d699a4144 SHA-256: 71571a0ebc92ffb8db0fbfb325ab53fcbd39e66e25a3004ecf1f0978e6ccb720
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=kk+poker+mod+apk PDF link annotation
    • http://kraemer-duennebacke.de/files/file/86673301990.pdfIn PDF document text
    • https://edusfera.pl/upload/file/19939475837.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/9415851129.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/63782666763.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dp5bhvsh06np4q8jpupidfaf5f/jizukewudek.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dapifonorusot.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109111618445706.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/14973653523.pdfIn PDF document text
    • https://cet.sk/res/file/42502728088.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/timubo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5a55f436---talobofegavufisoko.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/30274220133.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/86027750833.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613193d8ef8dd---godorape.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/14948621061.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/wedefamazezowukamodapav.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/damavegez.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/74215784650.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/r0iahfcgrdgcri0ffbr7jhtfci/muvimalajufax.pdfIn PDF document text
    • https://chptravel.ir/data/file/tuvejozuwe.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109051023149615.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vulenib.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/69053279912.pdfIn PDF document text
    • 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_off0000bcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD0 10128 bytes
SHA-256: b2da2dea72f1bed335c783e29da36cfcbd81b64e6d28cbdbc1b0ff77ef4f6184
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 20344 bytes
SHA-256: 969a42bb25d25522f6ade810f80eaac94e7787e7566881c2efadf7e41b670116
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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