Malicious PDF — malware analysis report

Static analysis result for SHA-256 b422230c9c60e0dc…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 16:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f4142348890534cdbae4c2289fba120 SHA-1: 8b85f6cbeedd37808748ba1abd6cd5ec35210240 SHA-256: b422230c9c60e0dcfd4f02be7603c2d1724a07e0599e34a0bdb5ee31d9834099
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=everything+by+ada+ehi+lyrics PDF link annotation
    • http://forglass.sk/userfiles/file/4286373309.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/98841584194.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/zakolew.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2e538069---66932031620.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ad04ff3fc25cff280549b3ebc4a395ac/33423064371.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/82662953278.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/zagapir.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/91039901801.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/giduvaberisuvo.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/buzadavema.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/ripusifimoretutijasamob.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/kewanulo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/zesadejenilefogura.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/95231525472.pdfIn PDF document text
    • http://htygroup.com/upload/files/lisugogebasemamoku.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd2429ba3---46091188138.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/felikew.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/ronifumusewufexelu.pdfIn PDF document text
    • http://ge-mak.com/files/9199304265.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdfIn PDF document text
    • https://webhosting4.net/media/file/29996236914.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/wevopujugevosilegizo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94273905173.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202194556104434.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33ce6895e---86142099715.pdfIn PDF document text
    • 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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 16724 bytes
SHA-256: e5526dc80145e6ea226e6776da2275ff4772283fc4896df46a2a8cb7a9142e71
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 10832 bytes
SHA-256: 30c474784bc1301d4f786d1ad076acbdd8dc8e3d3cd07be3c246ccfb5e390ff0