Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8129c278d9162d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 23:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e99dc507f1deb968641849cdcdcdb857 SHA-1: 963a5422005467b3b7f614577c14a498be5d55c9 SHA-256: ad8129c278d9162d3a2a6930423d39a959467be8db811715effe5a18ece910d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huthamcauquanggiap.com/upload/files/pabafunibezetop.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/64496642688.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/8781068417.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63542ae93---vaduzememunonireg.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/rixedew.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/31103473995.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/39156038837.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d4p9jcu3daesa9od8idj2vtj0p/37699675631.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/salegedumupomes.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/4996636293.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/popofuzajesodorukupeti.pdfIn PDF document text
    • https://zhansq.cn/upload/file/81369838572.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/98870354324.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/37be99a54e3ea9dd780571041ed483c5/19394223880.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6da16a0108c7fa6ca5deed215cbe6e3d/xisutavafepavaregozojefav.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/37360198489.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b760821f1---98759713167.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab590abd6f---31498434692.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791bd8f522---15801611800.pdfIn PDF document text
    • http://usagimatur.com/files/others/78832470928.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/60eb406a9f9db482ae00699f80113d43/jizotoxaboxutulirenu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jarizuxonevexalu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/jsghr5khlpj7ig44ku13q879f2/jutagigex.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/vonurakexanadikebuzosebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=argemone+subfusiformis+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/77670731547.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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 10756 bytes
SHA-256: 37e94dba1682c2834cb293e77d3527543a8106cd73cb5ad849398f7b41b45b9b
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 17740 bytes
SHA-256: 7052d4193b7017f49b3f0655d32e130e5e8fee1a8d2a0c7a1ed36ac7eda5aa0d
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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