Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eae000da077036a…

MALICIOUS

PDF

83.0 KB Created: 2021-10-11 02:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 57807e6880d51d7d99fe7edabadba2a4 SHA-1: b02abe71b20e37b70294b01af1028ad757f900a4 SHA-256: 9eae000da077036ac61037e66f99fdd90b7878b3428b531b8c9e07c8ed6795f5
224 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs hosted on various compromised websites and disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics indicate the document's content is designed to trick the user into clicking the malicious links by posing as a payment or support-related issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dkmmotor.com/files/userfiles/file/xufatibuzufujage.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3cf0df845f1839e3256d5554d345dd73/47821412282.pdfIn PDF document text
    • http://petrduchek.com/files/nujaguzumazunaf.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/58191111524.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/wulujidabarejimamato.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/winaroxon.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/70961306389.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161560aa2c866e---xodigodojekinur.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/6849720071.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/37459007248.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gaforeg.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/87524401761.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/51557611438.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/16906218402.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/sisiliranoborutobuvag.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/ganavopiditaxozozokafuf.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/57030797686.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/jutajuje.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73482695789.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/rosabotisepezopis.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413c959969c---salinotuvazafikekagezokot.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/33381622232.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c88f254b401c8067160c35f04bb45794/58013415135.pdfIn PDF document text
    • http://airfa.it/userfiles/file/44224859849.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/zopojifodux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+someone+without+a+license+cosign+for+a+carPDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 19112 bytes
SHA-256: 9bcbfc66f2506b59daeb1ac96d79641e3b8e37d2190d3946071d1b1d991043f4
font_01_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 11000 bytes
SHA-256: 3d6adb1c7f56642abfd1ef7e96f5822569d7c7dcf62f66b5277fcb967370f807
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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