Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba8aa2d754673b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 18:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ec85a4fedbe0376104dbeab447e7fad SHA-1: e8ef018386b97c3d4cd90e69adb840ceafa76066 SHA-256: f6ba8aa2d754673b318d8b4ff3e28067cc654f0390683c6cd823ebe10ae0f2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable domains, suggesting a link farm or phishing attempt. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/55286337779.pdf In PDF document text
    • https://ewt.cz/res/file/95756383852.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kagerokim.pdfIn PDF document text
    • https://businesslife.com/content/file/20651348913.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/28371725043.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/jerikovam.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/mejekisiwizozezojog.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109032238167315.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/68731165119.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c9b1ba7---bojafupogifol.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dinetonasavaw.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/94009851731.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/28248249293.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/58534724415.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/17304237075.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161365b5e3e844---fezekagusow.pdfIn PDF document text
    • https://ysh.my/userfiles/file/xeravu.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/dufupokifovinojabodaru.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/wesojivobeduzovaditofoxi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5he3p5v59g3t631ssi397c2og2/xafev.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/27121909829.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7c086ba228f8af5c7e646809852cd5af/nikotazinupo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c3b604netp5v2m44t8misptr44/62496567425.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tivijovif.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xamujetopuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nethunter+wifi+hackPDF 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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 17108 bytes
SHA-256: 820a0eb935bcbc38456590e5276d2c64105cad31af4a18098f5819d680cd5388
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10352 bytes
SHA-256: 3a5d71a6ac9d6578516295790c9ac2dde67d9af698bfff43df6b2b57b7be2c80