Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a547409d6061da7…

MALICIOUS

PDF

74.5 KB Created: 2021-09-28 03:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcd088c643da22241ed8add0f65a1d11 SHA-1: 979bfada20241b10c0d76c919f6b976725e1b7d0 SHA-256: 3a547409d6061da71cecbcf40c03e24c6e656e45596401046f454d20a16420cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this. Although no scripts were explicitly extracted, the nature of the links and the PDF's structure indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e3a9c7e1---45621556736.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b18dd2af1b---92757334035.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/demozipokorul.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/vufugafaraxopipedetevu.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/12284978679.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/dedisulusa.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210919111506.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210907121114_1206976983.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148c1fb8922a---29593358444.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fanivitopit.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/fusujebago.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/resefisi.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/70078831625.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/21893578489.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/besixujigiletop.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/78525561637.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/wadebafokawitabi.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/84637788088.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613165D02187B.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/6419938619.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/77106481985.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://pm-ural.com/uploads/files/76434283810.pdfIn PDF document text
    • https://intersat.lv/files/file/32918091331.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/85969c14058fa8f7d493c7e0911befcb/limifuxile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+apk+of+snaptubePDF 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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 17876 bytes
SHA-256: 891b8d244bfc3f4e5d7ac00f2de6fc7b5a757acda667f5e3ce0bacb18ea10f26
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10716 bytes
SHA-256: f11ed0aa34d18a61028356183193c9a2e4ed4d7066a3dd68782914925948ebe1