Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2f73c0a29ab76…

MALICIOUS

PDF

125.8 KB Created: 2021-07-25 21:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3c4ce3f84a8727bd03ecf5397682204 SHA-1: 946c58deaabd94f774af2a6f0267c9dcf5a4ad9f SHA-256: b0b2f73c0a29ab7666b2878351909e749dcd9d9fd2aa76011026a8f1bf4c4f64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://china-miyaco.com/img/file/20216182427.pdf In PDF document text
    • https://karinbentum.nl/uploads/file/maxemokegumadevubopirozik.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/17882650385.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/misuk.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074900dc1da8---86014439287.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fde414c90a4e1fbbf37e5ea98dcdae92/letovibuduwir.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6db3vkdq4lcrqi2jqrbjbqm6bb/35271886660.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/22346396901.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0b35661ec6f0b792741ebfa2c32322e7/firomogov.pdfIn PDF document text
    • https://daismene.it/file/xalam.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c467b7076---zogijedavefezi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea5a43eb3---sorabubunosebilil.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/45917609532.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/32057987384.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/fudiwefosanukagel.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dc50753677dce32af6e0292f6618489b/74710110590.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/65500220191.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/13406500483.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b5030f2a---52404470139.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/masibefizofaxevaki.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/xujagukeke.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16084a39bc1ee5---toreribobokodi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e954b52a68c4ba1e5caed1f825288857/11285326418.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5258cbd4---72745142545.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/suwiparexijidupejejaga.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edeaa9bae---62325105689.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rodivewamugukisip.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bup5hv7keknh2btv7clsas90e/51965512325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+apk+and+obb+gamesPDF 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_off000189dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1EF 17776 bytes
SHA-256: db9f395ef91bf207bf7eb0517d743d178e248eab27dbfc39093cd93fada3c9e2
font_02_sfnt_off0001d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D08D 10780 bytes
SHA-256: 3901acd1dcb2555093ba95f2a0ecfbe5ea76ada081a000e34a313d0a2340bb2c

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