Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8edcd8b7ee918f…

MALICIOUS

PDF

103.7 KB Created: 2021-09-17 17:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 839d3d28ab6143e945f01e19b1439bbe SHA-1: 34706c4482a22d58ee6413dc15db3cab68b46973 SHA-256: af8edcd8b7ee918f3e0c3c6d0466feaac2a4e576934e6fbfbead9445d18cfee0
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for links, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM highlights the use of compromised websites to host content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://orthopaede4you.de/userfiles/file/2982011552.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd402d18a---fudabepodofirugobuxumim.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/vivogulijitil.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/66999551030.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/18003169008.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/gatigofodor.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22a8c495e---97812934416.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bavukuso.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-1/20210901102732760364.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/lozozikuwunara.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/jesuvafodilivipekiso.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/kagefufirewikefuk.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138cae11d733---suxufujib.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/8482837446141be506d2e5.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/40188013745.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130191430eb5---gakukube.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/64640331539.pdfIn PDF document text
    • http://receptlap.hu/files/42917303635.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nufojinegiwudifuzukol.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/58946080544.pdfIn PDF document text
    • http://risme.vn/files/jodanugumuzolowibege.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45dd0df64---zasexitutazazozajopepedut.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/levowoluvumaretujiw.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/64870501327.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76470a43b---35206682205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=present+simple+and+present+continuous+listening+exercisePDF 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_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 11060 bytes
SHA-256: 9776f3c4117b9ebf027947d94790b388a2a3a9ddeb4d365674b8a364e5483a52
font_01_sfnt_off000145f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F1 18672 bytes
SHA-256: f4365e177b5700ba11de7aa90ee3ffdc8a71ea26591ca15223cc66c986d0c266
font_02_sfnt_off0001769e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.