Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f8cd112021e86a…

MALICIOUS

PDF

109.3 KB Created: 2021-08-02 18:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8840d1708e2d936da651ffc25df9627c SHA-1: 998834dca6b7c399bfbe35e51a6797d8431a514e SHA-256: e9f8cd112021e86aa451e18e3ee38a64926c5ae4e139572027824abd544c2fb5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a callback phishing lure, prompting the user to contact a number for issues related to billing, refunds, or security, consistent with a tech-support scam. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to exploit vulnerabilities or trick users into executing further malicious content, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1f6a46081---pevotoluwigafotizekageso.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c02e3ca8---wivun.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/740c59a7c2a3d424e4dee8c81d3a7492/91935494604.pdfIn PDF document text
    • http://debten.net/UserFiles/File/dixidegupezojixigepu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/tekogijudivamomane.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/giwima.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/30215859014.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ef6451ceb77788b7cba4e9de83043c29/ronifunemefawimazabit.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/nalimekupesomifig.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/4dof76mmdtqkmoa1q99setsrvn/94401958663.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c3667a8c572f2e6c07d787920ff11eb/68874968867.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/vujozasijenidumul.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bed3652c---55598225902.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19443154917.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/dfd2b3fdb0b103a7540b658bec9b2329/mixetakuvuripamuvexap.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mmu4kp88p8sodh5ag61rgu41bl/jezorepumu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608801e4a31e1---66244724519.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rorub.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/kowuxuwifikexunam.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vugawunizu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/02eb7cb97d082389786fff38539715b8/13100836312.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/6316212295.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609017ec7abc5---33112285388.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/82820028715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+verify+umalusi+certificatePDF 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_off00014a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A23 16984 bytes
SHA-256: e2278d8b028ebe4a258fb3ca5517e15da29d08ae7481ef2f2d582403ccf4e842
font_01_sfnt_off00017637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17637 10752 bytes
SHA-256: 58be8d0780b2fbe80f7b9bb9da9424782bb86366b06043be8993561dbf343e32
font_02_sfnt_off00018f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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