Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4f54267088d169…

MALICIOUS

PDF

285.1 KB Created: 2021-06-28 02:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55f26631b7f4b0abe945f6bd6de57a77 SHA-1: 51e4b94245c458431a08b99eb5f955f5f8a95ee6 SHA-256: be4f54267088d169940ce9406fe0b16c80edb1f30e4e218267840bdb0a37f341
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a phishing and trojan threat. It utilizes SEO redirectors and links to compromised WordPress upload storage, suggesting an attempt to lure users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing lure designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://lncxjzxxw.com/upload_fck/file/2021-6-28/20210628050159897685.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/14313487652.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/98c8460e51a0d764fc4a26b255cd8fc1/vubexi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/nunebolegenaxolafusep.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092f65570701---lapedojiruvibubexag.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/37688a3f3576996db6db1302040d9c5d/53772551304.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8bb4a812a70749699d85dd9362e683a3/minomirawuvisagevob.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42db5ea2fb93837a2b5585a4a82b6567/fuzilelarowozat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd659366901---nepozefuwir.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/6797591415.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/gejedoja.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/mivenikowozaf.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d20cdcd38c2---72665324799.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adf593fcd---92418310793.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//12930641227.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20cf470bf3---tuzomin.pdfIn PDF document text
    • https://cubic.is/userfiles/file/setomufujekowojofisosu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adf55caf96a---lusaragalig.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7c6236ff7ecd6a092ea0a0e7e8e9e211/jamipabekapibasaxogawob.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6kq30aia5ku2f1o6vam9mmuu11/94176144503.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d6dce54---31056192143.pdfIn PDF document text
    • https://inncredel.com/uploads/xumumuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=frank+zappa+on+the+monkeesPDF 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_off00040041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00041858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41858 10508 bytes
SHA-256: d95840b6058a36f4f7acde9079b7ed0b2001239cdbff9ee3d8da99e35cdf1205
font_02_sfnt_off0004301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4301F 19944 bytes
SHA-256: 993be66f2a53e480b09fb0b9d3f652db282385a6b97959e2818a5f1dd8305d20