Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8cb837759abdae…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 18:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52f1e6ed1cc025aff38fd70c75412a92 SHA-1: 41c4215156fc846f9d533bbbd50336fdc78736a9 SHA-256: 7c8cb837759abdae270745e8ab3adcb835e8e2ae8aaa34c0ddfac142ead52308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xomirusupinuzimapugisewo.pdf In PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b1aa8577eae61665132d38f759d7b43c/38844517039.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/jemotoxabasape.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/54887602327.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/43637793723.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c74bbef82518a97f5f73816aaa8f280/nojisorupifaxejojomiw.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/26698458456.pdfIn PDF document text
    • https://atl-50.com/files/file/tulaju.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/99116269127.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be22aaf4f5---26277467351.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c1668355c---92507404462.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/64318690771.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/brppgs29jr7eeskh4uo1328aeh/fizedeluredazitepisuleg.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9214ff100b9481650662b9bbfce7172f/67994361876.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/92240b15a59f181d3dfca6241d1e9165/35068193562.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/tidabamixolifebivaz.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/vugoxag.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/vijikojefonibaxoxopekake.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617130501709.pdfIn PDF document text
    • http://safarang.com/basefile/files/57667778287.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lunejasubofetesoraza.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/39926684625.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/44178246912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+become+a+child+specialistPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3620583ed---folutupera.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10792 bytes
SHA-256: 51df56b00022131ac13b6cd252f68397e025f1754b586461d0a274193dd27148
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16724 bytes
SHA-256: 8981902c15f20a8047474f6e0a7295d351cc6eef2ffb2c292147fb8bc7705cbf
font_02_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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