Malicious PDF — malware analysis report

Static analysis result for SHA-256 81043a1f71b9535c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 13:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f243ce93261a6153bfc337b44424183 SHA-1: 81f3935eb6f59055adfcbb78089c4ddf3be3fa7b SHA-256: 81043a1f71b9535cdcee6f99967e25b82dd4ca4154e8ba52e3ee5e3029c2c736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luxcottage.ru/stroykamen/userfiles/file/56942908975.pdf In PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kuwiganomajuworulegu.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/vevoxi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nugedamorasul.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/serida.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eebfe9c2dbd2caeb6148621a3664c87c/9618639927.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/48647612543.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/wepabezoniwede.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f22d386ce---rowug.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/13927262770.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/btco4b2ojn6c75ml5lismr0v64/69703270139.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f314a2b4088dce0f704713a0a5a6c31b/80197282820.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gavarefenomunexiziz.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/92465397319.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xexasesini.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210916222508.pdfIn PDF document text
    • http://fkhd.cz/data/img/87230483079.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/19101037449.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161483f2558383---tagebupevitiworipo.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/butinusi.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/rezesufegizodawodakafazi.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/gubosazuzuk.pdfIn PDF document text
    • https://limsurdua.com/contents/files/12862052047.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/32561570686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=powerdirector+without+watermark+apk+downloadPDF 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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 17648 bytes
SHA-256: 28aaa6644f2c54d8d3585deb9280cbf0054384f4d5f9773da960631de22fc1f1
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10888 bytes
SHA-256: 844ce20445c156b7800bd13753541e08addb0df9fa9d17fc17242f089ba3594f

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