Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70c71455cc10c97…

MALICIOUS

PDF

95.5 KB Created: 2021-08-01 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d10076788bc6b5a69212fd634a3ce4e SHA-1: 85223abd1cc67787a4dabd6fcf1d882ee14aca4a SHA-256: f70c71455cc10c9770a49124d116387cd3036bf4c3196661525b055c038763ec
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and URL analysis point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bkbflooringusa.com/userfile/abbey/file/50268136080.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d723f31db94---63433196096.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/25168161534.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3ac4daa5---xarifijoxivorerudow.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/19558367.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93053cccb---73303984836.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/girijogux.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607981bd072d7---salojubogiputupol.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/wudusexoz.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zuroridigaferivalenev.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021053000362325.pdfIn PDF document text
    • http://sushi-belovo.ru/files/84246785050.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/9360638449.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3hb0jrqbdcspodfig80jbu2vfg/58608036185.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa95551f---22261249976.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sopefetuv.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9166c6b9---21195576431.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/84974748232.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nabosenozeb.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7a9a298f7---19689886757.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/96237013346.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f18aee0f61320abd0fa28a44b2288423/78593484637.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf0b4cfc6---jodetedokigovadifop.pdfIn PDF document text
    • https://appfacile.it/file/kotewewodofo.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/88982060385.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/41715209741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+train+sim+world+look+betterPDF 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_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10716 bytes
SHA-256: 8f38b2e703011c1dc2f70631b071cf35b35a9be10f3e24ecdd2889844fbae586
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 18208 bytes
SHA-256: f6bceb7e0eb52ae1c3dcd4b5ee5e7a8be4ba4f46cf40f5305bd0937f164b26c4
font_02_sfnt_off000155cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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