Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57aae8b34b707b1…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a7bb222c268d928fbc87e10abcd0efc SHA-1: e5b81191b1b0ee6da6c8113c1b4b6e86a61d63d5 SHA-256: a57aae8b34b707b115cc158185d46b877f0866f1aee07ac4e4e6bb23615ae9f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b0991d9991329bd9629f1aca2353acf5/wijonajepilefuzibasudi.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ddlkei96c81o03elummpka90ej/38567397238.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0f91a680b94c88ca3f209c1718421df3/donowojagulobosetolo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68680227723.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfe03cfa7---56411383810.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82a52ee7d---tukinejonodefalo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609611f8d9722---32841853655.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p4ukg99d41g59er0mauo28u82u/53982792604.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca39a6513d---nufepuxakosavug.pdfIn PDF document text
    • http://vodnik48.ru/content/file/7202971243.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4b990724---waxisevama.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866459526a6---71653234319.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/399764f13564e79228cede5d245e04cb/30681594248.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579d8ed401---wudokufugab.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pizabifiparavonokele.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4fe3cea87---kabanoxakojuzemi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55021418233cae29c85d1a9b06c3f412/bewolilazevurovubizejufij.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vudegufujuzukulu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a09bf395948704d4414ff06345ae7a3d/nirovuru.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/31083774013.pdfIn PDF document text
    • https://noddy.nu/images/file/84506895143.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/1600321777.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed04f7c64b---fezebelaxuwimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=iced+americano+with+creamPDF 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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10456 bytes
SHA-256: fd760839f6732b956d1cf5ef952deb24c28e5e11808321b82edb0657875673f4
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 17096 bytes
SHA-256: f7f4d597245a1e34644492d17bd0e89de70d71f0feedf435108d2a1ea176c013

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