Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90bb101ae3d67a4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 15:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01ec122a45fb7562510c219d71dad10e SHA-1: eb97f1b2027634a8fe5c986cdaf74cdefdef904b SHA-256: d90bb101ae3d67a4e7c56657eb937913c2aac409fe0f11269d80472df037aae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, with one URL specifically attempting to lure users with a 'download minecraft 0.11.0' pretext. The presence of multiple PDF link farm heuristics and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://billionbosses.com/ckfinder/userfiles/files/49486995014.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f0f5b2f8b62dcdae4c38b7f0d2a5c74/vesidiniroto.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zatovoboferawelabaloxovo.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/vowusizopapegitab.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/jivimufumaba.pdfIn PDF document text
    • http://homeopathyhk.com/files/foxumobegodomunesugeguzid.pdfIn PDF document text
    • http://expresskaliski.info/file/34778526646.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/munumakikegazaf.pdfIn PDF document text
    • https://arerp.kr/data/file///vobunagamaxagadojaze.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/tinavezob.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/dafaviwomunowaxesuzem.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ketakulivafefexosukimutip.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/sodarivopazamijegisituren.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/37158063927.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vawakamagu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/98515e6316253e4e223a9eca4872f076/33084405393.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478567eb274---panalonadumunesurozulan.pdfIn PDF document text
    • http://nensi.si/upload/file/57359899238.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/famewapatewevewonutuxas.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613664dca1558---48916255718.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gemitirimerubazupoxapileg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+minecraft+0.11+0PDF 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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 17944 bytes
SHA-256: 660f1d582d9f0fec3a44e542a065a5c94a8e0eccdd68977a64c211dc76dbebe4
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 10796 bytes
SHA-256: 5633126861ae41f2581b04730705f875a34af060ff3922de6799bcca7f4fc9d1