Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ceda71e0f10e01…

MALICIOUS

PDF

105.8 KB Created: 2021-07-18 09:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 098caa9cda1ac48d6f35f0a1e74c5a0c SHA-1: 71b9acfa9df62410d4e38472b3ad7af1efef27a2 SHA-256: 65ceda71e0f10e015d3f4a967eff4c0290ea59414599d8aa174e74f17340b552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other unknown hosts. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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
  • 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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608995c5c31fb---8479246867.pdf In PDF document text
    • http://gdgom.com/upload/file/210614014517302120bfyvzbng4u6n.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/lebegufogibanej.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/fufemijewimo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfeb1fdd9---2478982859.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a327c2b3db0---29877550358.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d184b9a1b7---tefajefafibalevimudek.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/78497199230.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/85132928198.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xosul.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527f34837d---tudakoxuwigadotugu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/71035066961.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d79055e0b---kimefopatu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56dd3e8bf---81924537145.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/61287354752.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80d5ee57f---zukatutaweliva.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/24257263391.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/41898982759.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070c00caf80a---tiref.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pe80jtmk7e70dcfoggurvfck77/japuxipekejof.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/xubok.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69227681881.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098924044f0f---46038337636.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac8874f73---57383114864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anagram+of+remainPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10228 bytes
SHA-256: 3ce44ce6176187d9b16817feee602fbfdaf5878df668ef53b7b332f330dcfd3c
font_01_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE7 19512 bytes
SHA-256: b1c35482e6d76fde5d814affb8e07b54202395f26b31cdb68d13864be1a95be5
font_03_sfnt_off00017f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8C 16888 bytes
SHA-256: ce2cf941c41507321d374733769caa4ed0cfddc9d57642b4ffe4eb692096d3f2

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