Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a57a9070caf2892…

MALICIOUS

PDF

84.7 KB Created: 2021-08-22 20:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82682bb95aa4f2ef83dc694c14f115cf SHA-1: 7d79c1063064369084d87b5f80982f3dcf64653a SHA-256: 9a57a9070caf28925e2bc372dcdf120075acbcc60212a891850e594b643ecc3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it may leverage embedded JavaScript or other exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bawaniint.com/ckfinder/userfiles/files/43458316823.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3c4obh3q3r00kohhln56f7kab7/53294318512.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3608312baaadfd6c14ac48de59f8c462/29815879842.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vufekoginimok.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zoxonedulisajobupew.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609dc9861f874---gofuvafugaserosufuvifupi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/49bd70295eaacf8538017b5f17686680/43340866953.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/71372370667.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/suvowi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbcfa862f---11886626004.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/dupepamifaxoruzul.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a919e2a00---25013528678.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/25674200954.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/fubelex.pdfIn PDF document text
    • http://hinodecoder.com/userfiles/file/88588337791.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fe35fc4b---jojafafutitule.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vamuk.pdfIn PDF document text
    • https://digireg.gr/upload/ratuwanonopemene.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce411e70b---fafirutatuvo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/89649383348.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe57ad6a7f---91014991580.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/somodimurefefetobuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=microsoft+activex+data+objects+6.1+library+download+windows+xpPDF 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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 18024 bytes
SHA-256: 34da9f1787d59b163369ec4a0e1e9c43e85e67d276fec6e1fd0658348bdfdd15
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11528 bytes
SHA-256: 37c946fa4198cf8e9cac08385dbd9716de1ff3d095dc357a4f74654323393ab3
font_02_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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