Malicious PDF — malware analysis report

Static analysis result for SHA-256 782cad9312d542a6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 13:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cece455895fe98282af51f9e79d87af7 SHA-1: 809352b0783347cb6d1780226cbf1ee4268dd14a SHA-256: 782cad9312d542a6253076702e8967c43d5fe6738f4ad9fa8c157f534b4e74ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hbfilm.ca/resimler/files/9128793444.pdf In PDF document text
    • https://derfo.info/resimler/files/tikopetuvukevo.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/90568014006.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a94a86bd8---wulimoga.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodilekilorevetesitukefe.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/domowegasokupanu.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/10488992484.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/mapagirub.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fesanebe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d6433c4550cd80292f60c94127a6867e/wasiwatal.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/50122359001.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/66120481641.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zajudomusugosoma.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bevibutofej.pdfIn PDF document text
    • http://langyupharm.com/upload/files/14872301202.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/kijojamotuzobuxilolagised.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d017bf0b00---48947520849.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/vazajakikak.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79a5107d8---98015663318.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/4258136356137265f95b8f.pdfIn PDF document text
    • https://menu2uplus.com/images/file/12466194139.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/83016752787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fifty+shades+of+grey+watch+onPDF 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_off0000be1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 10888 bytes
SHA-256: c764a886bb706f8eaf56ade61ae7f57b7c2725ea147d6fce47361f6e53ee260e
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16948 bytes
SHA-256: 017643718fa23e5d36738c10ff9d06dbe4d23c8cb3261c90b1576405ee77b27c