Malicious PDF — malware analysis report

Static analysis result for SHA-256 71463f658e675381…

MALICIOUS

PDF

92.9 KB Created: 2021-06-19 00:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 08c5072cfcc062b6494bddfaa78965a0 SHA-1: 695f738b6b4ba5a4c6fe0843544f17b339a54c38 SHA-256: 71463f658e675381f843dc031f59f88f5738208b645762b6567c358fec6cd8f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's file upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, appears to be a lure related to streaming films, aiming to trick users into visiting these compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c00238d2fda---31043696843.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c93959fe9---rotanika.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa173fec397---18557535792.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/23716605075.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7153ede1---delujefumikametofomawep.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f150d728---7619618104.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/087150f9f2bf5b9e7d8dbf4814bd53cf/68468640774.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1df063b06---50913839667.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/56b9005356ac78ee60b09bce52e4889c/kogozurigalunujotezes.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55ce10274---61104911737.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e88e0ec1d---jowazedo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0be2515a6---38599450753.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b3ab80cd463975f2ae5ec75e9d99f57d/muxujejafo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pajinajagabebilid.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/vozegilopod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=streaming+film+avatar+the+legend+of+aang+full+episode+bahasa+indonesiaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 3356 bytes
SHA-256: d5d17add4724d149acea2de8820ef48bd49e36c4ebdf0d4822aa74488de04188
font_01_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 5760 bytes
SHA-256: 04c1e3d5c50a1e44f3cb6a2df3f3d01f52de7c36cee6dbf0d1e5c833932ad3d6
font_02_sfnt_off00013c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C82 11572 bytes
SHA-256: 8df0dca03ebc281ca29294f6e7ad94d07c1a8ed8eb25542fcb3b7b675c97d3f1