Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aa29129d0538d6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 07:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aba7fd3e7df4ad70c64403b1a0a2bc4 SHA-1: 70b03e863365889f7c6b80f7d8209441db853e31 SHA-256: b5aa29129d0538d67b17a5839e6f1675b205db7f7ea9ee1078b87ecdc61851ec
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress installations, indicating a potential phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 5

  • 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
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3dff48b05---54007076223.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/usn8tamnv4f4fem43fpmsb9trt/19947016541.pdfIn PDF document text
    • https://maviet.vn/upload/files/napel.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/84309261413.pdfIn PDF document text
    • http://mdtrend.hu/files/file/9969094514.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/74426003884.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/wekegutugatofewakuvagubi.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/78883279403.pdfIn PDF document text
    • http://roocenter.ru/upload/file/83404845859.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/55902555229.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/jokeradugabebafez.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fa6d0e456160f58346e384488c3b016c/novezizadog.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///69999921159.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/54339856010.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630731695.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/38981679140.pdfIn PDF document text
    • http://beiks.info/public/file/riturejo.pdfIn PDF document text
    • http://it-hair.com/userfiles/54086069535.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/78481002855.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/gatepiniduro.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/73001338699.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/pudelamuxinogisuzol.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/86674753571.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a41b2bc76194df352f77ebd267802525/57287389499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=heroes+legend+idle+battle+war+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 21048 bytes
SHA-256: 5747f9b6271c6658f2881e733431e7a26e8240fd270b45f1d4329a2c21b00d5c