Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1a990bbde97cc7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 05:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca85472b8289802d191f906c2cc26e42 SHA-1: 3ed54510250152b134c341a8ebf5969c9ca6206f SHA-256: ba1a990bbde97cc7c22307154cd5df822f9a71b30faf295ca76bf44ba3a85246
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.tzounakos-insurance.gr/ckfinder/userfiles/files/raxalowuzubunifiberisuta.pdf In PDF document text
    • http://phupmirpol.pl/userfiles/file/54916162104.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/86832851657.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109110038148391.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/55f10d297074a07c571d00b170e87517/gobiruwapilazofi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/91631437246.pdfIn PDF document text
    • http://full814.com/upload/files/47580350775.pdfIn PDF document text
    • http://newo.ru/files/files/6638570602.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/nuvejopomasabu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/gupokumelumakexatipi.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/43290166092.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/davalawukatodawo.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mamatuzagavopusinize.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/tilazegovejarowuzaseluk.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/3434122682.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/kowus.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/28ab6edaf79b448bb97e0cdfa1deae78/gugaripe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf56ec00d---55699172304.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/fajewij.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/79919664796.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109032346591569.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372badb42fd---mubovegip.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jufisosibuwizolavoxomijuv.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/naxuj.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/70967934021.pdfIn PDF document text
    • http://ashioke.com/images/library/File/86262410803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+windows+wallpaperPDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10356 bytes
SHA-256: f088879a50a0a9ecea0cdd959bcecffa22509f047340a86e0f21a1c975fc7161
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 17012 bytes
SHA-256: 4259f53854addb1e1c8a02bf9b4c55b95d55730c94732bcb0643ad233ab75467
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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