Malicious PDF — malware analysis report

Static analysis result for SHA-256 442bee56aab57c00…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 07:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcc218931651de500ed60eb6ffeedbf1 SHA-1: 1470abbe361e35fe87ef23f3a44f6faca196f21e SHA-256: 442bee56aab57c007b44a2011fb012cda2deb0bfa379ec6437c6e68b0cc70f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=thermax+boiler+pdf PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4306d570---bigexezugudolemenaza.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/dikusosipimutenotop.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/23516491862.pdfIn PDF document text
    • http://preiss.at/upload_files/files/27478739016.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6880efcf4---tedonidezipepejev.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f164f5ed4c---3261591660.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bojilonajirufovi.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vamobazasaripovixedu.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vapoxerirez.pdfIn PDF document text
    • http://juentai.com/userfiles/files/85562278251.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/tiwazinaxowigebodiko.pdfIn PDF document text
    • https://linker.tw/files/55475090864.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/dapijitefepexenuj.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/somonujugugugitokufofo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d48f4ca9a---83530419375.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/69856077239.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f7781faf4964827582a28260488aebd1/tepesorikagogefutaxu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qo6r153c80uq3k0uda08a9lqbv/jonaxemoxolumawile.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210812222416.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/zuxowuvuzidebe.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kbjo7e8lo4ua7elbjnf0fegqfg/vexafedamexeridu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/95769086766.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8571ad9dd6---27378263772.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_off0000baac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 10600 bytes
SHA-256: a3d14366bbad3ca5c0f540c56a9d7dbe4af71f1c02fbcbfe2e7ae1fcc769099b
font_02_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 17684 bytes
SHA-256: a9c50918684eabd5d5cde9c1da81977d0131ff69b73b6b3755c128a9d6dbb45d

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