Malicious PDF — malware analysis report

Static analysis result for SHA-256 496fecee69d57bee…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 14:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c8cf4beb81a99cd9a67fae992e1f82e SHA-1: 076cc1451cd76e0708c0a101e39c5b02b225690b SHA-256: 496fecee69d57bee28a0d422b7e31ce41ea7e2f293e16fbe5c06cf2bbb778178
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.bandungmesin.com/file/51058668582.pdf In PDF document text
    • https://taucaotoccatba.vn/images/news/files/11009439504.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/83651441163.pdfIn PDF document text
    • https://faprosid.com/file/luratezig.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/65400a3f1449a48a89d0d16528418012/40452776167.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/370689432.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be829aad15f---likejeregamaxugizuvaf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088699d847a3---57239221635.pdfIn PDF document text
    • https://izr.fr/files/34374409291.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/mifamararavavuwag.pdfIn PDF document text
    • http://ledins.lv/cms/file/59219089170.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/79097307052.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e42dc4875---bujebowoji.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nijixuvezubajut.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fanawimekatixamo.pdfIn PDF document text
    • https://cartolmania.it/file/nusawanokis.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/bapolupavozavebexaka.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9effba427---73919227723.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/61756333970.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/70573294491.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/32678661100.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/73016527042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=torque+problems+worksheetPDF 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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 21664 bytes
SHA-256: d9d07da983d2a3c6486ff4199ed79853dd4123d41c8eaf3090b3721c0b528d2e
font_01_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 10684 bytes
SHA-256: 93adcc65026114f367c2f0b89f2f0070b17cb183db579e1ab179695abed5e739
font_02_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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