Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff377960faa13be…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 22:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b03713bc9a455403627bfdf55102a3f9 SHA-1: 4ef576e186d02ef2b7a65b3357941aa541cf7309 SHA-256: dff377960faa13be7b74a3a7960dc33414be236f6ef49536fbf55ef110492b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coinmarketsuite.com/ckfinder/userfiles/files/pitiwugapoxup.pdf In PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/gulewip.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a34c55732---pavesaselomixoxerazatig.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080ace1df9ce---70331340639.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4886f4f9e314581d57618e2769868aec/97508440818.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/94287107341.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0bb2623f---ronafuzazigoj.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0af5d5fa7bfbd981bb8a91284d3de076/sowakopibuxuzevij.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/d6jepcu3k57dtiq1gcbru2jdcv/86406565223.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kolikelijagapujomowebaka.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zevagedupumadalevig.pdfIn PDF document text
    • https://t2sc.me/userfiles/19785855849.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51a0d4da3---bowisirawidudok.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160815b1942b8a---raxobulis.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kofegagotudubisedu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/vowijuribuvobenebal.pdfIn PDF document text
    • http://sgpeo.pl/users//file/memuke.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/93468261226.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/73485691061.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/4492526128.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dd4fc4b9715cfffed775a1d9c455cd59/96659548343.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/gosivazorejotadefunagowo.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/memezej.pdfIn PDF document text
    • https://istanajp2.com/contents//files/nexedasonusupezakaxetu.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/vemidepisekig.pdfIn PDF document text
    • http://haai.org/upload/file/supimagosizagigole.pdfIn PDF document text
    • https://fultoys.com/userfiles/94188918689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=organigrama+hotel+5+estrellas+pdfPDF 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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 16876 bytes
SHA-256: f84f246afb1854ddee5cd2f48fb7741e10c718788625ee1efa416bf6bddf0513
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 11104 bytes
SHA-256: ea7fc70fe6a35cea995164bcfff76a873385ce0c7cad4ed4bf8a1ec6d43011ad

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