Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5d844a9540674d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 16:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df38edd51ed85bd98ad096215c908e2b SHA-1: b297d90afb6b6be8393ecafc38ecb43be3be833b SHA-256: 3d5d844a9540674d78173c9ae9a930ae163ff8ab753105f8b53b8666686e0761
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://drafthe.ru/uplcv?utm_term=can+i+find+deleted+pictures+on+my+phone PDF link annotation
    • https://jhservice.net/imagenes/galeria/files/posuf.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f618ee7967e7636f4eb3b3a4e97e7e0/9529743661.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/noguraxisodegili.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497f9fd7825---kizibemogilowowupixosan.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630692745_2e594b3d04.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50272812616.pdfIn PDF document text
    • http://vejwun.cz/images/56442877254.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffe8ec81f---rowewimamolupagizevun.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/wudokobubuligopaj.pdfIn PDF document text
    • http://someteme.com/archivos/_20210916114758.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/921375543.pdfIn PDF document text
    • https://ka-base.no/images_students/files/bejepivanowefanofibofop.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f4a1abe5460effaf49c1b32fc600165a/94974180072.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/ximojebape.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/vanoj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7ca03a11744cf8391db7a84625bebc62/bezub.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/3156522570.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/darogalibedonakiwoxip.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lemelumiponilodis.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/80289554385.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/85806371639.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jutuzan.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/xavoto.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/kufitobawimobokoda.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/66105500909.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630651893.pdfIn PDF document text
    • 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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 15932 bytes
SHA-256: b3ed4f7036d36eca715f30b946ef66f98c0b5a309bd689e7979a763005118150
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11132 bytes
SHA-256: 66df37ccf28ba0a58966980a827e5aafaa01867fbeaa23e6c4cbafc12971be83
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1