Malicious PDF — malware analysis report

Static analysis result for SHA-256 11784d7454806e43…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f41427e8bb53ef9af2185bea91798c68 SHA-1: 715fbfa6cb96ea91bc37a87e2450db2af73af232 SHA-256: 11784d7454806e439732c5c0c3215d1304c6cf23e07b8698d65636eb0ca02a83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=car+overheating+while+driving PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c788af6eed9---nezexesamujekomemujuduno.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/27527539781.pdfIn PDF document text
    • http://hrudolf.com/userfiles/45509336381.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rifizizaxuwesipogal.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bidepenageja.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/566d8f40392019694c51971b1e1e560e/nifomekaguxasadikafenivi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160755adc77bc1---70898334072.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jc095u8c779cph515njpv347eo/46311213648.pdfIn PDF document text
    • http://hydrem.ru/images/file/61019234933.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf206fe6136---tugidasesonukekumogisuzaf.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f35cc37ced3b4d80a7ae0eacd83cdd9e/44523306365.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nelexi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/40133733318.pdfIn PDF document text
    • http://christopherdallo.com/file/44742954472.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/63883368455.pdfIn PDF document text
    • https://noddy.nu/images/file/vinoxepej.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160888e5d1f6ac---dewofesewabidexaxoned.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xatetukozevegobemixerew.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2e6da1fe906713d29f6d5eefb2fb8930/17072369527.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8319be56174453ec2649c1548be87504/dopuvukizilifolez.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f903cc274---lowejuxikumozosexenudu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081756d21bcf---finofojibewoluboxelu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e9627626c3079133d7760fd9c03e6169/21101402142.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/pemarilizamufifom.pdfIn PDF document text
    • 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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 10544 bytes
SHA-256: caeea8a3326eac0afcc136dd5dfae18e3e7d280027175c96ef515067868cb48b
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 17004 bytes
SHA-256: bd2206b29293c9ff9732d335c8a28f4fc1150622b8e7b7e5fe4a02c4b9c7a364

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