Malicious PDF — malware analysis report

Static analysis result for SHA-256 412e5ffc2f18af13…

MALICIOUS

PDF

84.6 KB Created: 2021-08-23 15:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: afc72233faf9c53babfc278204948a80 SHA-1: 2911a616512a4f62cf3c0f7ad1bf1ba87aa1beab SHA-256: 412e5ffc2f18af135770684a72d53fc2eab4fc40334e8d57484425989f012852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers have identified this PDF as malicious, specifically flagging it as a phishing or trojan threat. The presence of external URI links and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9527

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=prayer+for+discouragement+and+depression PDF link annotation
    • http://rana-international.com/userfiles/files/wafogi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/34731115105.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36a75b5f2---bexonusig.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/55fe4b6935ddc58a8548cc8639cebcff/72517334971.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dd55e999---69219940532.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/61489007243.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/fagesovipe.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/kunopag.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160742f2841733---konofadulinoj.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/39731917232.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/17523823798.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/zewumarow.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/40732711029.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vopodigajererim.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/55501555973.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/vutusorijafop.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/boxosolexime.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/39245778415.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/69549517402.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/rosufukilepujekifufi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/rupategetigizopuwonuv.pdfIn PDF document text
    • https://premium-house.uz/images/file/puxaxawutiwotenatud.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/vazubixotajixa.pdfIn 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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16860 bytes
SHA-256: 89dc830ee714e4b7660b9e7b7770083670a3259d25f0c642858eef844c8aee42
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 11132 bytes
SHA-256: 6800dc6079a2fb200c8fa16f0339f64e860237e23b8dd55dcdb614d0c63aa55e