Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a1dfb356d38bcc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 23:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3d3af125f0212f42e6a3ccd561b3b97 SHA-1: 3161cf5057e31874950d3d6c885a74cc1dd41b7d SHA-256: 51a1dfb356d38bccf6432318401cfdd28b3b0c1b374585c25c7e1d41610120e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jajugroup.com/ckfinder/userfiles/files/kuronogexukaz.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/55577559708.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/58256091638.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160928a04ce0e3---livotizikivoxomam.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/takojumajivixiturofijilat.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/67611500943.pdfIn PDF document text
    • https://777mto.com/contents//files/bediv.pdfIn PDF document text
    • http://3q1p.com/upload/file/210706191853632752a9momtietgn9.pdfIn PDF document text
    • http://chinalabware.es/d/files/vaxawox.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a11e1afdd0c610d32a8ec473673b2e63/57696344633.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/75221857498.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/moxujupafulebidozegidi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/81614033177.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c02e3ca8---wivun.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/11666452582.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/340706de5633c69e4a2d9602d5b84424/vagujigajifojufafefota.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/65881801190.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/6674421250.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/vrl98np0kn1il3oitcnldud91c/juwafope.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dugumusaretelulur.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/27678934653.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/iivfcidabc6o9cpdbtvi79hkf0/93012916809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+multiple+jpg+to+pdf+linuxPDF 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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 18004 bytes
SHA-256: 1059a5e91be6e9a56eb477d2dd8ad6073158771400076de5d25d2e50abfddb89
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10940 bytes
SHA-256: 52019befe536c495eb283d713e8282658ec1bb6b79c143286b6f77ed0f332405
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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