Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be6355e7ee20e38…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 08:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b8a105da0c68a549db1da0f272ae78f SHA-1: 616a54121c0b7b08f959377cef84bbf24cbf48ed SHA-256: 9be6355e7ee20e383bd48bab578883cc223fb37174409d6d05a96d6e68053ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://avenue102.com/uploads/file/bunamalekatujugulap.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/movegibitokepiwiginakijet.pdfIn PDF document text
    • http://goodline.by/userfiles/file/sedizerekuwujosa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081275af010f---sozetisupubok.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3ebbb96feab4af9e5413c2ded1acecaa/44426693277.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/pilumalapidigozaj.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/lulivametoxiliwifis.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/lidusuvikokuwa.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8ae7aa2a9da3786b47abc9e3ad27fc5/gexetunadufivagegozejabem.pdfIn PDF document text
    • https://tsegypt.com/file/rujezibinudigubekilosu.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/foxoxutifer.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f783247d33d---poged.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/03c25773624b86aa332bb7e06af9fb5c/lugowemojovuwufapojugi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1fa58ce34---forijetimuvokuvutabokimej.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s4eap0iek730mhh2t2pjjq3s56/jokukufuzijiragapijexov.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2nubo43hkgkul78ttbe93d2l85/10486665121.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/80442205132.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc070a83f8---jisaxefakifowupevaju.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nujudamokunujizu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608243650b00b---xokopidudotumebowatud.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/navujiwom.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24818a0292---niten.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/fabikowig.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/12208983899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vulner%C3%A1vel+significado+rafaelPDF 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_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 20216 bytes
SHA-256: a4c4dd09c795606b29c280c9ee82c90bd007ee6807cf2dc6f4ffd6e7a0275bcb
font_01_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 10868 bytes
SHA-256: bee25118480c105c88aa5ba6523731086c6fea7c7d2cdf8588521e3030fdb63c

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