Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb97fa885f34e45…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 04:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 91c6dc156e3fc3d89a2c11358dc19d50 SHA-1: 0e865ca5a36a0800076d2e54fd1fca59037fe962 SHA-256: 0cb97fa885f34e4598165f2e6d144ef6312bd89b849e1d6238446a36b7c8c627
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://rapet.hu/files/4995552858.pdf In PDF document text
    • http://ooexperience.be/assets/Image//files/90073177746.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0f0ea1dc---gekowosojonojugu.pdfPDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/gupamezafejezugovawaveku.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/78069780568.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ijbe0dp1onre3q9ro86aalhev3/34580898232.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/78774438571.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/dipuzutivolajudosezukukeg.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jegrq9i439q3gq0k7doidrv232/62299239303.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/risusolu.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/h490jh2791ter2unap77lgb6ee/maxizujuzosizefifimip.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803ba13e05e---vofaka.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/98271799006.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-24/20210724181000495931.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/tovaxapezok.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/53037745813.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-10/20210510112441320819.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bedulisos.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6d4ae51f5293f4492837e4fcfc42243b/pifikurewazikoxosukatul.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702232b4d8a---65589008651.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5fc77bcc6468286e8dbe9bcb45970450/zajipaseduraxirige.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/favetadov.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0275a782---tigepiximigijakolexovogaz.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/rirukipufeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=modality+in+english+language+pdfPDF 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 10884 bytes
SHA-256: 573dacd28bf6cd4bafa9f2e3a263c422cd7641112208ec4d1a50b34b6142c6df
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16688 bytes
SHA-256: 80b4487df022f3bf1ff33d41d21a22e4f3e98604174e06fff9e40ed0ca9603ec
font_02_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1