Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5e541f8423fe1b…

MALICIOUS

PDF

89.9 KB Created: 2021-07-24 17:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a423844e4b3a40f69889e188a3c0225b SHA-1: 899a033805d53b186d13726a307ad446d9357573 SHA-256: fd5e541f8423fe1b88136251673e5a28469a72a352a5d0bd268419ee94380d0d
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a spearphishing attachment vector. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://muzeumostrowiec.pl/obrazy/file/falusodepuburuxevo.pdf In PDF document text
    • http://tokyoto.pl/UserFiles/file/zivunile.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5057f0c004---biwevazew.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2vidukai3vv69jhnm8r3jqfg9t/83840794900.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p1ptpqp6clur89nh3mkenvhll2/65828886243.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/20262972547.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60278598---19409378284.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/sakudaxewirosobopizi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b90ae75a4f0548ae70aca5467919db57/23333910025.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/29171619341.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/78471422931.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/zogumakujederepexapizaki.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/87ddbiirgaiit01vb8amk9cl56/73642567940.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/nadasikar.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85f7564f7a---14811505534.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/robovewaxuv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f477ee6ce3---64941594958.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/71534382041.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a766b37355---goxizefupadizoji.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/58706670400.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc690e0fe7---nosuziterezemozida.pdfPDF link annotation
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/janubag.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62058576720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+on+keyboard+lights+in+dell+laptopPDF 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_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17168 bytes
SHA-256: a2203cfee50db1396d059258d2849229d00b0c77efe1175b6edd5ec81e5733b6
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 11192 bytes
SHA-256: 45e84398619b8aa9c644208a753e24b8ba8e164837d1db7e4ec7485314c619ea

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