Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcd0267ed58c98a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 20:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e57f4b30f27efabb965163d2fd38eb0a SHA-1: 6c3ca8d801bcc4f9cbe306e9fd78ff4a8c90e0d0 SHA-256: 6fcd0267ed58c98a0e579405bc678771654b65362bf7b967b7160b26b721a8d3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The document body is unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marsalanoleggio.it/userfiles/files/vetikezenebunavul.pdf In PDF document text
    • http://szolnokepul.hu/userfiles/file/jafugajobakiniwusuna.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/kesazopunupesitumexalifo.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/leteko.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210926000018.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/20526477334.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/62025272508.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jenorafuxazaroga.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/96999386007.pdfIn PDF document text
    • http://live-net.it/file/20250011160.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/2362510728.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/25414910715.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/budupe.pdfIn PDF document text
    • http://mousike.it/img_ins/files/kulevo.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/53646741249.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1d2cdaf505c50a158e4c39022c6ee37c/gisin.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1avvegd2ug5uf7p9qms5bp0sb/dogudanenozezake.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45692516391.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0008da090---62560803785.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rojixapuzupajam.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/84548395091.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/getekisimekezeloni.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6139894a38052.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/75730602657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ppsspp+gold+freePDF 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_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 16452 bytes
SHA-256: cf330b89233f374d517d6ff41354b692f2283fa7ca5797fc1d84622a2af98a92
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10220 bytes
SHA-256: 95726313c85941e2539ac6b90d2e2d7791103308568a04965459e64073e86d24
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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