Malicious PDF — malware analysis report

Static analysis result for SHA-256 200b6b028e567029…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 18:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f836052114ae44a24c3e8e9258bc96a7 SHA-1: 956327369d47209560b3d87558f4c87af221f848 SHA-256: 200b6b028e56702976eed976bb1970ad0763840aac210bc8dd5b4e15fd6447ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=video+wallpaper+mod+apk PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133421a8c73f---23943111012.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d8785e8b---zadufavogemumofopulera.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/bonap.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jorisifipiruzomixutatizim.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/34009294198.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305071c70d7---ramulexojo.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/furavizokenedugalo.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/6501941348.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wowudigaxunuguwumabunik.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/zibenawimevodetuvikejig.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/86651665830.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japakekosox.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/33648245356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c3cbc87e---58377630876.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/96562916131.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/kodinakojutaxixobivixoxe.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/29608249808.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161324d336c75e---65738434594.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/38343500691.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/ririgu.pdfIn PDF document text
    • http://oris-am.com/editor_up/towafinupivasup.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/mumuvosexewen.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vasokufumaz.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/mixodajazuxolonave.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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 10332 bytes
SHA-256: 2bef8d365e52d85d48e1defa632edc2fae10f25dc0f3ea2c47ce536bb3188159
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 17464 bytes
SHA-256: 9a178877d60df5e81c516c11064f8b7912bc9f768afffb8539404b62f615a3cb
font_02_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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