Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cf4566904650a2…

MALICIOUS

PDF

92.0 KB Created: 2021-08-12 23:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72ddc78e94850e4e8833de3b37ad89bf SHA-1: 3b3237953f98dc1b20ffc284ccef6ab54ae01cba SHA-256: 03cf4566904650a2eeac83199981e306c5098fa7a0f86d7a3b13fb643c89fa9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e1f8b117afd5b963d41c50a7c4990ae6/59031968805.pdf In PDF document text
    • http://mevlanaasm.com/resimler/files/11687314566.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2febf724---15036840507.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mividugidosukarifaradig.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/rulepefuwitis.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cs6q4prs8nqsvqnrlipkrgvoag/94534682095.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/68459892024.pdfIn PDF document text
    • http://sjhtractor.com/d/files/2693316671.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/kiravepojuxixodijut.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vewiduxesiraxakudit.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061395537_712727934.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/jafepukaxilam.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee598ecd4---19062563153.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/1165555225.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/8k3g7vs98ggvcg6ts3kh8n9rg6/mujiradixinu.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/beborabelevaroxotodijixaw.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210801_052719.pdfPDF link annotation
    • http://hongshengfish.com/uploadfiles/20210630/210630052244994264ti2p47x4bjig.pdfIn PDF document text
    • http://www.520amis.com/upload/files/nigolimawidolomawewitotut.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/15981493167.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/wixowopoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=studying+seafloor+spreading+on+land+worksheet+answer+keyPDF 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_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16984 bytes
SHA-256: d1bdd6fc47f55b854477fa28920a01f037eb8014d7824dbf337843efaa3b845b
font_01_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 11244 bytes
SHA-256: aad46fd239977b4f6c0a0ac115af37939ef464222768b0c61671772bc7c8684c