Malicious PDF — malware analysis report

Static analysis result for SHA-256 d773ed0400b4cf85…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 23:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 073ff37e1f9e1e1940d755e0e2b1f9b8 SHA-1: 68c198623db304aa483f73c24326abded57383c6 SHA-256: d773ed0400b4cf85db75d5404562c8e9e8086cabcdc0bbbde97430d10c8d7337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=adjectives+with+b PDF link annotation
    • https://toptenstudy.com/upload/files/BodyFile__6144FF3F1B8F8.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/82838595745.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///90492476783.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/motule.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313d1611f1f---48506992548.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sitejubijikuduzol.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/13552778444.pdfIn PDF document text
    • https://mkontroll.hu/File/xerovalepelajubugelo.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/mebekegek.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/22804643613.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc5b0884a---lorisusuvejavebibev.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/xikivozimu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/41350911936.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/pejokepelisijedebeko.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/49394207362.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/46810292144.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/kipabor.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/84784247619.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/3104940983.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e34472b1bea3f5fa8f8d864a3e6bdfc4/jelefezopajiwitanumonob.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/13287653195.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/bufunenadakedabiw.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/fitarifarunigofi.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/modamewinavamufowovamojus.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149eadd20161---datorikit.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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 17700 bytes
SHA-256: d6860157bf7b8cff9a081206526bab2be2e4e79f74bef3e6a5644e4149dc0af0
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 10340 bytes
SHA-256: bee3433d8959be8ab694644f4187a948475e2a3bc5aaa99c868d36715badd96b

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