Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85b8a644df57a42…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 07:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a99e82710cf411015f91d155b815f8da SHA-1: 59cfd2cbbe7de9d2780301e784d3fd67b64cd2d5 SHA-256: a85b8a644df57a42113c7ee2db9c0c8967b8f8591e7aa316dbe78431ab9a7a3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many of which point to compromised WordPress installations or raw IP addresses, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76520924572.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608346a522b5e---koneligiferisi.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/baresobatoga.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/83636379627.pdfIn PDF document text
    • http://accronline.com/userfiles/file/begebefafawitovufirobo.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/66040503589.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9884090c7---11946441038.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/ginonoropixoru.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81199a1c2---tuzafebedoxulelin.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aef7a730c32---67943541254.pdfPDF link annotation
    • https://sportsslife.net/upload/ckfinder/files/tuzirupopekefinezufow.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a3ed9e05---gapifararonozapek.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3abeb45e38a5be0a30f7478d87e49510/gufukunonitewelun.pdfIn PDF document text
    • http://debden.org/userfiles/file/72859874664.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gaxifugoragiber.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134b43e25aa---3341674209.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/75311658299.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/86271911124.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/29633079962.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43a7e31af---dalabuvidajimemul.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/natabelibufunojidesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bae6eca0d---vusexeju.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e30886418---tineworef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=communication+skills+past+exam+papers+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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 11108 bytes
SHA-256: 3f5b855943bf390c7b16cf6d874cf69588962e20ccdbf515fa8b7ea52282e1d8
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 18040 bytes
SHA-256: 304851edfb7ed5e5a9aa88914be93e4488add815396f2990ca8780017d3a87e3
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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