Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9a223f75973d50…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 02:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82417148380d36f8c4ee80eda01bc131 SHA-1: 8812fc9eb837ebcbe4083e2999d1867ccc965ea8 SHA-256: 4a9a223f75973d5083f86edbd0c1181b32ce5d8cfd66637e050eb68cc4cb5a6f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://carlojans.com/cms/file/77380159707.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5hok1e0ttbehqm86u6iu8cmkaf/12657980687.pdf
    • http://choinka4x4.org/cms/files/file/nasivikajirefejuj.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607115f08bd9c---tasajojigonuwimatuluno.pdf
    • http://eaas-journal.org/survey/userfiles/files/tinunapazegodexafuxomus.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f484c96ba---30502950471.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/40841734916.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xitamopaseg.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096140606eed---rutadelijutipaxogasuxo.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/valerugodizekax.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f96a4addc6---godejupeluzevukitu.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ods864pejr31oadem62jupmfnt/50367342345.pdf
    • http://angeladaniel.de/uploads/files/68160405258.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1onu6jfdfkvpujt4ol8b5qqp3/kutukikejujok.pdf
    • https://aronabritcan.com/userfiles/file/buporozoko.pdf
    • http://midel.me/userfiles/file/tiwofekopo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/80d115913b82692cc4d1a481592b1fae/rumogonaposufafozizil.pdf
    • http://nissanotogovap.vn/uploads/images/files/66927854567.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/muoh8vh593te79v0que3pbvri5/54031225575.pdf
    • https://itandem.net/ckfinder/userfiles/files/48516953480.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9d564c5c2cff8865c3fdabfc42085a70/17321170124.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=iti+question+bank+2019+pdf
    • 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_off0000b389.bin
81c4cc2e755cd4976235df6b06ff807a3a04e6bd5ba61b6b7996b606e1c7e579
pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 16512 bytes
font_01_sfnt_off0000dd1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 16792 bytes
font_02_sfnt_off0000f536.bin
22f0a0dc0120884f8feced0acefffff1fcd2b242326c8e17f82345ddf48f9d39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11236 bytes