Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbc1c0e44f86557…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 06:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9db070eb7802630d6f7ca3e08e680104 SHA-1: 4576972279f4c34647942045fc9bffbca0ae1049 SHA-256: 9cbc1c0e44f86557e3b371df86ce80817f82b74ba9797c9e5a9d29b344879ef3
164 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised websites and a heuristic indicating a deceptive download button suggests a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious, indicating it likely attempts to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=prentice+hall+biology+chapter+17+assessment+answers PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505125903444730.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc1461a1---95022360522.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/razix.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/fapezabajuw.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608479e20da58---85845233633.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/lac7q3oepanfjtl4oc2eumf6al/dopuzo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c5dd87d97b32141263cc10d9ed51259e/25718924974.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/p9tf72jojmmirrbbun992777bp/58781239723.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6dea645aed469e8befac958db29e1a5b/90206753689.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c2921346---lojomawikosebe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8et615m4n7vcnjg9reo936m1u0/3000114628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859489c71a---tolegalemopevepop.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf040a8f013---15827304056.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gevugud.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/60bf8315cb763c29b1622eea8b03c0fe/xanoninap.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g59743j7p24r7e6bp4tl004ort/weduxudafuvev.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/wemofotoxukaja.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/84962957268.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/gigasuvip.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8372d90d5c9592745f72e0cfdbf00c1c/guwirusirunanebetepususu.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/danobirolip.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/serilefanuxazilud.pdfIn PDF document text
    • 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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 11264 bytes
SHA-256: 9f6d4418ab41609e4d5a5c40cd786426e76f6b53c7011ebde6bed01d4254edf7
font_02_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 17576 bytes
SHA-256: b013adacfd2b8f7c4eaca0cdab2019748d75f6f4dff38e65febae6fcfb795043

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