Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9b1e1598826e85…

MALICIOUS

PDF

90.5 KB Created: 2021-08-16 02:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9dfea465f2450ee118a816c7017a70b7 SHA-1: 6c4f92436e2c6e383111388ab4bfb1b910c2035a SHA-256: 7b9b1e1598826e8537002be0ed17cfda138c124624918c6328457df907b05911
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alituncer.com/userfiles/file/93433919746.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a8079f59---denizatusupetedebab.pdfIn PDF document text
    • http://vinmexindia.com/uploads/gobikiponep.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gelowulabis.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bupilizan.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609820991f1a2---sevaruzozatufe.pdfIn PDF document text
    • http://flirdining.com/uploads/files/nolodudafefoluge.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a856efb27c7---liliwesemevazavejipixen.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/kuduwepez.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/semijusixajuje.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/dafaji.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zibekipolarinukalafuj.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/rugolalujigowanelumogol.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe8620e40f576dd0f4f7044938fb51a7/46890849422.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5js24ve2ttaf36u9kf976pgec1/62240503808.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5d8ba6c3dfff19c935e4f75f5b9c5c96/95689887584.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/6917386450.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7caccdba7bbbdd63658a3f538d9aabce/kelepijomolanefimamolipu.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210608162312752855.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/gapodutawabibaz.pdfIn PDF document text
    • http://alptw.com/images/files/21036166765.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed2a6dae2---63285164040.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21817199882.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/78688745143.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/41704118883.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/441e36cf5468fe9562bcfeced41abb5a/79849311428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=order+of+adjectives+worksheet+pdf+grade+3PDF 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_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 18040 bytes
SHA-256: 708595a48108915b725a1ca1a7ea99a092fa3305629cd4fe8ad847f8c7f29db8
font_01_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 11320 bytes
SHA-256: 17f3272e6020b494991694eee4af25c099b47bf169ef2ea3af90893dcdbe3c91
font_02_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1