Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9529956c8304da…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 02:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e8dffe47fcf5a5c035595b3b70cc47d SHA-1: e534b12d0f38de8f0e2edaf226a0448c6008a8c2 SHA-256: 5f9529956c8304da2878ad23a2f50862702f6cc6b581780352933cfa782b69a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm hosted on compromised WordPress upload directories, pointing to numerous unknown URLs. While no scripts were extracted, the structure and URL patterns suggest the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

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 http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cb1dbc0a---zomazidegono.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d74c856ab1f7340b5bd5dbe51e2ca028/lakuruzeruvoditofufilezow.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/zobube.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xezakupirikopedubofulo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6e6c3c36---noxomufodo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1627759287285.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/virukaxi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/65737417505.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6324a1fc7---lidubalagopagiro.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/31256854553.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/17941602603.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/83128017709.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/30873092686.pdfIn PDF document text
    • https://tavio.ru/files/file/18488927862.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/lijoril.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/4985868501.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/wugis.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/sitasonapakonesumixojibo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d39216bb798---43667136345.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624176531.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kumitivogipinuzivebon.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/51lot1q2frcdp4l3uh77miij4b/91610695379.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089044d83b1d---jisupej.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc5b704eb9f13680014be7764502e270/wusigizejipeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=morfologi+lactobacillus+casei+pdfPDF 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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 20076 bytes
SHA-256: 5082ca6cc96ba2776832783afb050b760f26a2840264c678e8d85ebc1231c8bb
font_02_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 10924 bytes
SHA-256: 42d28d79a37b0c1f598f530a3a4f31c95ec638a59b0af84914671b5fbf1f48a8