Malicious PDF — malware analysis report

Static analysis result for SHA-256 72886d28edf694cb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 11:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e0b329cbe270fefdaa25e44f0f51b16 SHA-1: 5d03da91d866fea9c21aff178f7034dca0000624 SHA-256: 72886d28edf694cb64c881e4acc38c663811d2574a81ee5cb2702d0288a7f398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.awakohchang.com/image/upload/File/ojilimipe.pdf In PDF document text
    • http://solarissoft.com/img/userfiles/files/getedofitozadivegedigogiv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321adfcb1df---belofud.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/44343361343.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/61534816270.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/14311118659.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/bitopagodojezamovik.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45213964978.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xitux.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210930_0DD5B3A03D0DA073.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8661709f---93266681216.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/xavaxorixagidit.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16152a12a450e3---zilikadolimagus.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/28147613523.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/31351115244.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/98391991177.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/zejojubufifawi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/55160254756.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/99897597506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=clean+master+pro+appPDF 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_off0000ab92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB92 17304 bytes
SHA-256: 7e34698c1156a1573e563950267b91c49f8259b941436b870a2313389de82e94
font_01_sfnt_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10352 bytes
SHA-256: 7e0a4742b11b0d63e25faab0616b8fef8a6607235c9a7ebdc97a88797364e89c