Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1045bfa51f2bed…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42770536cbf52490d86fb004fd517c75 SHA-1: c9b28f9d3ffd5edd60cc3b6c2a01a0854d7beb48 SHA-256: 8f1045bfa51f2beda8ea9201fc06cab1ca466ec26403d11e62fa54863baf9c97
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, such as http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/86lpqte8rghpndcld4cjtq4127/39359604462.pdf, are key indicators of this redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://webinaris.blog/ckfinder/userfiles/publics/files/96004067707.pdf In PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/27024200374.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02b9581d3---161396106.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7469403395d4887e5ad1f40f67cdab2b/vonusikekiwelo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b0256e2580346757c13a851965493061/30386023184.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210605_E8B76DD3A15C2F37.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a7778ceeeccfe454f848222d7deb531e/nolemusajuvedopenumal.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/86lpqte8rghpndcld4cjtq4127/39359604462.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34c52e341---ladiwifoletazinawozubop.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/30654792418.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/zarupunob.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/8141028829.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/balufit.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/tivodisuxupurajoxa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/tekaf.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a3dd5629---6939250162.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/94463483907.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/42655246352.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eff0f431f618358335e9f0eed7c565cf/54461317902.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/71011958277.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/mozijiwoperenuzu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9524bb58f7af7c4f3d307d6e25feaf08/31065698521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vocabulary+exercises+pdf+2+esoPDF 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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10956 bytes
SHA-256: a056f5908392089d2626b96761e5c435cf5669467833acbe610dada91939a7ca
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 18684 bytes
SHA-256: 69a8fc562d7390edfb5c52352abf7d18c9fc24b332111085be553523772372ec

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