Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42fac085eb29e5f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 13:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5ea0f8203cff3f228a620e0b0b3756b SHA-1: 7e0ac8f2a6906f2304d45e465946e55d6d9464e0 SHA-256: b42fac085eb29e5fbfb737d4f5e211f99f2f951e27cca3b748903c13c5ad0319
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3656

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 https://garglob.ru/uplcv?utm_term=the+walking+dead+season+4+android PDF link annotation
    • http://hillcrestneighborhoods.com/userimages/gupigu.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/xadozuboxajejukovu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/lusefalizazafevof.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/gatidoselowetonovot.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/fopof.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/19230292728.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/25212423440.pdfIn PDF document text
    • http://idcla.net/upload/files/xojolifevedelimoj.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/kodofuvowevasavu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/resedo.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/nuwurawinagotebuzuko.pdfIn PDF document text
    • http://didopack.com/files/37601339716.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3611a8e8c---jojidasufi.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kokibirojodufopibotased.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/37220766947.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bulizaweralusupato.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bd22c148dae10fd7d49fc23ae5da0b07/rovodalava.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jevefizunowigir.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/xowetopeter.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dafe2319f7bcc916012dd62ae9d2dbf2/60218628259.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/revomogojuno.pdfIn PDF document text
    • http://state-lithium.com/upload/files/31146584881.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text
    • 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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 18912 bytes
SHA-256: a2192f1439ab88de11526b60705b85fb5164337117ce2d8d24863caadacc2cbe

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