Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7112966ebf539f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 04:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33c72acb6719a8f93f6003b55d3dfdab SHA-1: 3dcc3dcab94fdd9fd963d104bc5de7caa97b4d74 SHA-256: ba7112966ebf539fb1ba4c56fdc0c2a84ff41c60e3b3c39fefca348ddd558885
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://autodilygood.cz/files/file/7528034387.pdf In PDF document text
    • http://architettomontanino.eu/userfiles/files/fekawawigeguguba.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/22786224238.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xixeradonufefizikore.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/dogotisowivoturugovuma.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/gisunuvesawizotibi.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/fetarajaditirugalasuzuxe.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/biviwagoladobatadofavopo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gejuwajevaravilejig.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/zuvarikolexa.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9j62ao0sb5ughgv88k2bkracc6/tajopitozudenisosoten.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nulezeliduxez.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/16296872148.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/91117450401.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/bidofikajol.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sirugawozeletujeretuzilo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/wibusomafuxovuwufigika.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/73416546460.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb88e0002e---56783528326.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/siviniwuvuvipifo.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/wufisubagiluxabij.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/16485932586.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc70bb2dc9f995ac943cb1f9624ba662/24534305425.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091307172573499.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/99156417258.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///25729665148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=10+letter+words+starting+with+ePDF 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_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 10688 bytes
SHA-256: f12f9876fce32328993061e426a16b622fe34079fd507f624d152a965d14e98e
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 17812 bytes
SHA-256: c275e75aa3d3b769492010fa6e271127673b58580ab35cb60015218a72da3065

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