Malicious PDF — malware analysis report

Static analysis result for SHA-256 5944c30a86942dc5…

MALICIOUS

PDF

92.1 KB Created: 2021-09-08 03:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbf799a3b994caae462cf5f445583ab5 SHA-1: eede6f5d798a3e31cc2fc59b321f0e8c8b667146 SHA-256: 5944c30a86942dc5e7dee4b2fadd8f37cad01021486d8ae3cd3b06cf70de3647
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely serves as a lure to direct users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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 https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a0389dbae456bdb3bfe94dcdc35cb12d/jasizawurevibijaje.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd22e2717---13893643542.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bc360a8---71604918018.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/volegojanopagexutupe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/10c4c19035bf235e1f839ccd6da96723/vewafewafupuwijek.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0ed5953e1fdabc8c48d90d477add6edf/laregapure.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/59112924199.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pakodu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa76691fd18---80019450780.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/63a07e5044a2e7949c184cd6f7b61c0e/tesojufidipi.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/57019280040.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/migetamodobinuja.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nokidezaputoneletukupon.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/27822712077.pdfIn PDF document text
    • https://areicon.com/images/file/vumeroposumezozowiduwatig.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/edva9njm648dkiod8pjanbsa8v/88089652915.pdfIn PDF document text
    • https://invest.pl/userfiles/file/lidatazemine.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/renatof.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/20172946354.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/70397182011.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0cc986fbf37c558a146aae94b13367dc/35935076158.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/wamomegaperosedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rain+bird+st8x-wifi+manualPDF 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_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10976 bytes
SHA-256: 12936a1d86da6ca7ddc01ee6795024b0cc89b3062720c8b537c48111fedd8d3d
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 19348 bytes
SHA-256: fcf19356d8e8742e2f8cfadc6184618a3470970d62680e13931c2e4c03e5f237