Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e78a841339f13f0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 09:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d41f58e4fe057917cb05828de0312f SHA-1: e81e81482f1b29984ead7679e6a1c90e1c822662 SHA-256: 3e78a841339f13f0cd68ce714587dc9a976fb517d331094627d37144fdb30c53
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with multiple URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.tiande-global.com/ckfinder/userfiles/files/6550355244.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5d2426df---kudaxinomakupunusetewumox.pdfIn PDF document text
    • http://hmed.vn/upload/files/80063633230.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210913155222_3gaika.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/23670723692.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/famarakasoxafimuf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f325d5b1---93808316299.pdfIn PDF document text
    • https://dyaa.club/uploads/file/fedegiluvezed.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nagafovexafu.pdfIn PDF document text
    • http://anindecor.pl/files/file/baruviduzulixulexejifik.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/24543994613.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161386b1e5aaad---ragul.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/mojunuxugikiwot.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/acd0mh0pn108i92ggm3giclmou/11546150263.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/fexawajetejanajevigul.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/32252590145.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74072591866.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/tupemixisoxasunuted.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nerovopolipez.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/56624489680.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a1fc8e25873ed931a67c9ae73dfd3940/zukim.pdfIn PDF document text
    • http://samtekelektrik.com/files/33529361729.pdfIn PDF document text
    • https://lesura.net/userfiles/file/devefixexobor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=recover+wifi+password+android+phonePDF 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_off0000c2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B1 18024 bytes
SHA-256: 85ee1b628dff1375e74c1cbb87ff02d4614893c39c9ac5a9105c974e2000f811
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 10768 bytes
SHA-256: 8eb7c927cc4cc51317aa3de27caad55250efef8bd8829bbb96b619b978bbb284

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