Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a92c67e5ba9c8b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 09:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 171c8e6eb8e17a3fc7a89016c2d4feb4 SHA-1: 7d5c25c229ca3f03bb66802bc58e71c5cc6779b6 SHA-256: 76a92c67e5ba9c8befb121afcbca6259aed0dfa21cd319f063fb138b4cad321a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick the user into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • 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://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/foluwamarufobelokepopawad.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/3669399017.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec71d0e9f---tixusazuzulevam.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/75976509697.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/japobaxaj.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bogeluvozojibexibatafegin.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/64873524089.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/sinezi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/22819667490.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/47713032451.pdfIn PDF document text
    • http://byecook.com/ckupload/files/tobawubilidagivokakeg.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/2379251650.pdfIn PDF document text
    • http://mlead.net/images/e/file/28695634055.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614484745bb4b---89574230138.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/46801213575.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75703083065.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613454af27424---14683644179.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44981224541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=c%23+guide+pdfPDF 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 18512 bytes
SHA-256: f7d56f807500d16aecef701085fa64b5bb7bdc54ec7ae4479b6c6279df30a6e0

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