Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0ba7912a446386…

MALICIOUS

PDF

73.8 KB Created: 2021-09-30 11:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7f620f10abe7919089a9066c91d82555 SHA-1: e4e4e29ae8219878e199a9475a858593334773ed SHA-256: 6a0ba7912a44638696f9c79e356e8571510751302f460ae102bca8e1e1bd7ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arredamenticucinesiciliane.it/userfiles/files/88545013606.pdf In PDF document text
    • http://xmzhj.com/UserFiles/file/wikorafiligadude.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/nalerovalakod.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81773430919.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9809b886---jufizepi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/pokugudelesinugizute.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16146de1be3338---37991151671.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tebinafapoz.pdfIn PDF document text
    • http://seamacros.com/upload/file/20816158421.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/83268743812.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21618491033.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/67448344601.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3d21fddfb521abff224f81282a0943cb/59437309108.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eff056fed584bd9dadb8da83c209bb33/foxatekifemumufoz.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/97631624689.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/pimuwuduvojajotojizat.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/12717276585.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/buletetipilo.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/vabixogowokexowo.pdfIn PDF document text
    • https://andrejc.si/files/file/56039212260.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/sural.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/57721506125.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fepelulufovasuzenivoxes.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/tapabizivejegapumaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=galaxy+s2+android+5+updatePDF 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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 10992 bytes
SHA-256: 8a2380fb18887896628c92ceb932ae5e1bcf954b49670124469ecf73e4592d24
font_02_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 19440 bytes
SHA-256: 584949bee114ad0ccd6d1e375f911a4b3ca89d60119b71f33dcdae7cfae68254