Malicious PDF — malware analysis report

Static analysis result for SHA-256 308e81766adb2280…

MALICIOUS

PDF

89.0 KB Created: 2021-07-31 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5319819bda226edd29aa4d2fb6fc0807 SHA-1: 8b21122107b73a4441113d129fe71b7cc240c3a4 SHA-256: 308e81766adb2280dbd23b7569ee23ebdbc5defe1328b169fe7562f20215bded
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable, suggesting an attempt to direct users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://morpheus-architects.com/file_media/file_image/file/xikoka.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7a5ddbd97454d3e614f8439c50d23b1e/tikaxesiku.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ipmgi7vivmb5acpm5qkqn3jaig/38593589256.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/74162408722.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/62242253304.pdfIn PDF document text
    • http://yuha.be/_files/file/kixafikopimuvalu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/xumelonoligukoju.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/21914479964.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/difere.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/15654373184.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/texawatafikirenejikob.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f5b77884---65977778781.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/nusiropijofi.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/dc99420ecfda6237f546b79862c91a19/robafetokun.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/44c1e5e7ad5dc0c700ed9323459fa58f/47074930461.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/2130484138.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/27216124462.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021060120312680554.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/085a0772d9f67ec1c77af266a5ec97f9/mupizudutaxaravogerasutar.pdfIn PDF document text
    • http://sam-global.info/files/file/suzenuxeladawewofefut.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gklvq5v2vjnb1k3fst6lofbikn/29124997622.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e5f7587a---13367262310.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a890b427faa---50109549014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=persona+5+royal+when+can+you+make+satanaelPDF 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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10928 bytes
SHA-256: 40917b62c170d2002fd4f7563e676619e92e952ef63c306da3dbcbd868b28b06
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 17816 bytes
SHA-256: 7f66a9d7903684803cebaadda806062a9d014b17e32d7501535c756e57ce55e2