Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e8308aee9a6d76…

MALICIOUS

PDF

96.4 KB Created: 2021-06-30 07:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43d15be9e0fe9aef7b022e0398d46c82 SHA-1: 129409cd3af7d5d81eb2174fe39282840a55ef0a SHA-256: 18e8308aee9a6d767d540a69da14a455d3a7c416f49f8a3e6a6e3f4bc4a4eeb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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
  • 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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/svrcsnogafiu1s7jo002t94m9r/10787209509.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/femexikegivudumetarope.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945adb3791d---94996893411.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kabenawelemuwiweki.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/71819799469.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162138620672.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d4289fbc---kawizusilun.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/541ftoud3po2c4lh5itt2idln3/wojulaxodebawusopiwapul.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b728d026b875f9901b5cce0a4e6566a7/zutejolumi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec729ebda6---84405895155.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc7159df8---56128825374.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a98bc1273---zasebibuwisabixorojino.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d257e5d8a9---wuzawofimuw.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e93bc3a96---wogirafojebunanined.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b987f864bda---66222654857.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ea733343477773724b8d2752d4e4cb93/22970596001.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/dovivaririr.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043008313169.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/burewogaxazilor.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e9b6758ad7ae80b9076fc7a63d67598/76758501962.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/59051897169.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/55cf0f4c7d1e12b94dc2e1189f494cb4/53444846819.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca71ed1ba---66028131808.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/cq5usvkb0aq07grtc6brbhcc4m/rusibudejurikiworugezij.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90bb8daa8f---julovelapewem.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/bavorenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+the+word+commencePDF 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_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10788 bytes
SHA-256: cd37d5a54ad9c29fb67950eeaffdb97f38f6068148afcae0286f1260984fa001
font_01_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 17380 bytes
SHA-256: d1c4310c23e63a1a8a7835c83a3c67b9c4f7f883e38d3857af65c33eba89af7e
font_02_sfnt_off00015c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1