Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae9efbceb86facf…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 01:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36ca8f4bf26cae48c960f7cb7a2f019d SHA-1: 07d4a9b4f566ef34d918b6e8511b18fb1995a0a5 SHA-256: 1ae9efbceb86facfe15ec58c244130d0d30f357b031fc885fb411e1c5dcfd643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=how+to+see+who+a+private+ig+account+is+following PDF link annotation
    • http://jayeonrak.com/upfile_editor/2021/files/34566922744.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/687c2e337f828630283dc56132d74848/40625285066.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/safoganonu.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/fitowasewadi.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/tulukovekusodi.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/79798223740.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/39839182151.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cmrc807hdq37923i37jj8jatm7/60268607126.pdfIn PDF document text
    • https://netlandschool.cl/files/79983025868.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/31469268645.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/75058399599.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nelilor.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219252117357708.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e57010c8---83656346330.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/22663705226.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092019295773499.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/50640528631.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/51476548079.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/pazulubifabeki.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/88171452925.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/12715127280.pdfIn PDF document text
    • http://imi.vc/upload/files/6174581031.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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 17036 bytes
SHA-256: a474520aa97d756491927c106346fa4f0608282fac691196c3984e88f3dfe475
font_02_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 11004 bytes
SHA-256: 26b80199c80771c7406970d0de405f824c7b65dcc5253703a0cf80121969234e