Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d043b4e1e2eb818…

MALICIOUS

PDF

80.0 KB Created: 2021-08-08 17:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5f9b9949105da8b0ee1f2bd18b0e0e SHA-1: a17d838b2b71e4215fc5927ee3ebe78dd3da0156 SHA-256: 7d043b4e1e2eb8186c5ea661a00ece603288bc82a374d5042fd24f919ff0972e
154 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised WordPress upload directories, indicating an attempt to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5142

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acce95ddb47---kidebaxewade.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4acc1e04a5---rudunebo.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/munetuzaza.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/7577923215.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30174290064.pdfIn PDF document text
    • https://slide-bearing.com/d/files/7613619129.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d437c9800---25420213572.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/wivezofogamobetexap.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021053023424813.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a69f387c---9523783499.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/296dcbbb67347e122022ddf955d874ea/35708438757.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fe99cbd3---nivitunanaxaga.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a54e15284---38233256419.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/fanirifawuwejokom.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sivatibukosamazona.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kaliziwutelol.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510d090ff4---6764771259.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/kuvezenigoxiwub.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rtf689p4eicfkmfdc88fi1gvmf/24670013704.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/femoluz.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/20370146045.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7af0bc6b---46339300757.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/xavakepin.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/57986629288.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4937eb8ba9---55243477723.pdfIn PDF document text
    • http://teplospectr.ru/images/files/boliruwivolakepu.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/nedewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=los+super+campeones+capitulos+completosPDF 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10592 bytes
SHA-256: a0cc43a17d2fcf171d6b45f2f7591b76b500e62f4849a3bc1f4337e7d2ba2a0c
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 18056 bytes
SHA-256: 6562a703bd156b4827d4d820a43eff2d293a90d00c82e0936a2bb15088fc0071