Malicious PDF — malware analysis report

Static analysis result for SHA-256 42567c28c3d451c6…

MALICIOUS

PDF

93.1 KB Created: 2021-09-15 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43d5b1adfcf62e90c93fdfceb106b462 SHA-1: 08d2a0d0fcb8f4286fe6d1dfcfbf5e7a4e3f6489 SHA-256: 42567c28c3d451c6fde576382b844bc0cee7866c651c62a614aed808ddb63002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to external resources. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution vector, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://synerhu.ru/uplcv?utm_term=kannum+kannum+kollaiyadithaal+full+movie+in+tamil PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613305e168695---luzozaxomora.pdfIn PDF document text
    • https://gameclub.by/uploads/files/45859634100.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/81533481762.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a3fd40ed---37149623662.pdfIn PDF document text
    • https://ms01bet.com/contents/files/putikita.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/7587643168.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379100706e5---57170054202.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sixobonamaborol.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/38067120956.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/pejipemobilide.pdfIn PDF document text
    • http://rc-modeller.se/images/file///fegekibixip.pdfIn PDF document text
    • http://ausafe.net/images/art/files/11146786792.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/94078083668.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sirit.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ledusegaxajuvilamu.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210914_7779BB5CD26ACCBA.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091302175473499.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tuzapogoboxodasugotu.pdfIn PDF document text
    • http://chineseclothingonline.net/File/58639529571.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/xopuvotuzulomuvapoxuz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gijekuretalajavifurikil.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_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 10716 bytes
SHA-256: 1a88771721cebb5ffefbf09fb6c70f5011dfd8f18f690b2147eeda23b441ac3f
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 18900 bytes
SHA-256: acf9ee30a7b43e02f6cc29bc74620747be8318c3f113b3ba3e335280596b665b
font_02_sfnt_off00014e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1