Malicious PDF — malware analysis report

Static analysis result for SHA-256 299dfbd486a86fb9…

MALICIOUS

PDF

97.1 KB Created: 2021-07-30 13:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3753c7e508a69b2e9a53412d892f2bd4 SHA-1: 346d1da1a5a9c1a6964af81acdfdd9bcc63c5643 SHA-256: 299dfbd486a86fb9eaa136e93f2d2aff2ec69600b1020d9c89622a4dd4f851a7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://adabaskimerkezi.com/upload/file/leluke.pdf In PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/63959272728.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/65926154819.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210705_130821.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b125e2a077d---begenetejuva.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/go323fjnr68dn9egf4k70h6vvl/lujunotupowanigaf.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bb2e9204e---zajijamenovawa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b487467ad6f---91999105988.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/33d0be9a7098a698a315f5b3b2617dce/26800869479.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/86939618345.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ab474dd33---kuvivixadakozurixedov.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pezawegezijepisovumeluke.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zabebobepud.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4d23aeaa61257b91b2f4cea7bc59593b/96022814137.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/60088383327.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507120031.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc8b09a46---879574921.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/aopmhpvfo3h0tcvt7hjik1ie16/mujizekobulaw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b9345bd6---95497510816.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a8f6e93f---4457310295.pdfIn PDF document text
    • https://clubon.top/uploads/files/74322559587.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae08afd36c8---21920459200.pdfIn PDF document text
    • http://eva.am/files/e0f6c0d05dec85d8.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6143df58---diwawifubi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abecd8d96cc---begapidubazu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832b87ca9d---demugapimiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=warcraft+3+reforged+system+requirementsPDF 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_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 18188 bytes
SHA-256: d5d226ec492696559316e43315446dfcf0004277308809beee1166ecb0faba4d
font_02_sfnt_off00015971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15971 11300 bytes
SHA-256: 6ac40dbd492d9f05fdafd07be460968e6ddbd0fc673a23514d33c6f3b7347833

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