Malicious PDF — malware analysis report

Static analysis result for SHA-256 628cc18c263719e3…

MALICIOUS

PDF

85.1 KB Created: 2021-07-19 11:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc3e5be4afac3496d3aedac7253aa0a6 SHA-1: fa89c549bf26da73e1d944464157b35b6f5ed119 SHA-256: 628cc18c263719e333eca0874a9f85a77bd570c0d87d594322e92e8564435f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The presence of numerous unknown URLs hosted on these compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/es2pl6ua1dlho6pmd1lo7s17rf/zozubatomiwovew.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/3ee12d9553013d0c014b144200125072/dopokopokujulesezisufuved.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e643f4c03af---32631821785.pdf
    • https://tortugafilms.ca/adminfiles/file/tedivisanizuwaj.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad38f99b569---xofizepebomoramivewip.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd7bedaf0---84469648548.pdf
    • http://bdn10.cz/files/file/tudovuniburatenimun.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c4e57a11---minagagemobevem.pdf
    • http://slsnn.ru/content/files/wepamemepaba.pdf
    • http://offerseir.com/basefile/offerseircom/files/winusip.pdf
    • http://brkvinc.com/userfiles/file/39294228907.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ehm2g0sqcchk3s6lq3cq35uae6/butusabutazedol.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/km7hbnf0b484a54o6ht05hcv3v/75435404381.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m11rkua5819grmi17s2miv7rj0/98974140493.pdf
    • http://kaies.cn/upfiles/file/29020968071.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3d8htjkfne9ufb48sgjp5b1v0i/73772880107.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ce140659---38101140366.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/7529626282.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/7998519512.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/givadilo.pdf
    • http://ibtaker.ps/userfiles/file/91659591561.pdf
    • http://adabaskimerkezi.com/upload/file/58757047806.pdf
    • http://vigova.com/Images_upload/files/70982073067.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=silver+philodendron+yellow+leaves
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 16792 bytes
font_01_sfnt_off00010308.bin
ff2c1e1c792b9457e2a9e8731dbc323397c26328a4a0d61eda3e4d07ac173174
pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10732 bytes
font_02_sfnt_off00011b99.bin
551bce8a3fd7cfdc5685b9f9949806f512393547af5e78730f120277844725cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 16820 bytes