Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad56394fab0c124b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 16:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f7e31f198bf88ed1dc8924b4568b4f2 SHA-1: 15de85ee23b34aa644bb60361411aa2ed1a91e00 SHA-256: ad56394fab0c124b657286579d39f0132711c0abeacc3fc09c17506614450892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+can+you+cast+from+phone+to+tv PDF link annotation
    • https://tatvan.in/userfiles/file/fikuxixo.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/sevijogugipenoxagur.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/posizod.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44838589842.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140514ebaa72---nadovorogu.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/towalorezonaxumunofulef.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xosatodusogepulokebu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/47284488261.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/35053611160.pdfIn PDF document text
    • http://demkapi.com/resimler/files/loxukofevowanukapozanuzo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/doxovekizuloxazaxade.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/nenokigakasapor.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/nokikifinepuxidixu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/vazafowin.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bupimejexijifarog.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/kipajijegewababarala.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133276902196---47857212974.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vagabadatox.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22223783646.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02b249fe19e1c0ec7f7421bb90d0ab5a/vasitapugozam.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/podedabanumur.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10964 bytes
SHA-256: 45dfbafbf31fc6b8632ac9a6c90423926dd23aa54c9100003cce5740cb219fbd
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 18296 bytes
SHA-256: 7c043e76ce194c2de843045f9883657533363148e672c2e2e56073a428e6fb1d
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1