Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba3c7c49a98987e…

MALICIOUS

PDF

91.7 KB Created: 2021-09-02 05:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03d4ffc99aa2954b597c72df8b1fb5a1 SHA-1: 56be04749e691b29e421184b5e4aee98e178ac62 SHA-256: 8ba3c7c49a98987ee2af1a2eb23d754c90219b83be35385eb01960dea5e71752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://irlanc.ru/uplcv?utm_term=mexican+places+that+deliver PDF link annotation
    • https://radiosmile.hu/upload/file/75746061036.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93bc26fc---tetisudimosepasuxa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f0432738a---97069321900.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/3745393141.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tutitaxovijasap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/802fdc5d3e077b0c660b739636dfe312/lerusopodolovinuzupoda.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/disapituwiwomolado.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/eff12b82230b7e9623f8c6dcb22f1a01/dijeroxemukavuxejate.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kibed.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pamedawi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/guvedewiluxobaz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8d4af88e26129e2c9fa9de604ec3936e/nabeseg.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2b23df2f24e8784d05bbb165fe0197db/fewebepaparimixemavuv.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49f011669---15187717833.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/1724504517.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86ad33f25f---wepigonevatesu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/69521040405.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/zobixaliduwax.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/vuneb.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/91327178987.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3tgkcpuhvei31d99mf94db7qv7/82099687958.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/5859365408.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zemixogufujo.pdfIn PDF document text
    • https://jss-moms.si/upload/File/89082140965.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/15662312074.pdfIn PDF document text
    • https://remini.hu/userfiles/file/dinotiz.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/pobinawuzarod.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_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 19308 bytes
SHA-256: 2575175451268eef618757318c9319d37f43fb11d65c86c362eed6fcb4fd77a6
font_01_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001486f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 10652 bytes
SHA-256: 243fbc05af9d5b5e266bc5977a362f11b72a4b0ae769765ed984863d3fed5643