Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80a0960c236f4b9…

MALICIOUS

PDF

109.3 KB Created: 2021-07-08 04:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43049241f9d4b08dec21b7004b9e510f SHA-1: 4cbdf8641608da881cd1509e3636acbddbfca22b SHA-256: f80a0960c236f4b986af0b1b36d34d12ed52b158262ba15f6aea27128c8cdac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42ba97e19---niponetagugavop.pdf In PDF document text
    • http://easyreturn.store/userfiles/file/fivarulotusefar.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/65886823018.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f14b76410b8698117f27325766295eb5/parabanajunolegibuxoxi.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/55251225072.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609449548d993---mavabuwivivogusorufotovav.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/82939173004.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/92187735475.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb67dae0---33170633162.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/unakd65l3fnkc76ja0torur8dg/rumipulin.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/fanorisikuno.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b14664ba9f3---sijujonipuritukej.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84516175148.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fed01a31c---12598674254.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/568ef969a3241c9960f549c6340a0f30/41047261582.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a585e2ad---50730201017.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089647c75036---lirew.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210708044510.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/poruvelesutobu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8ce9779b71c6eed97b4258a2f6d4ad66/delanuvitokowosijaruv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fd1da978---32031374064.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4365eb6511d54b33e755cb354b445230/lesajiwadaxesewineriko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+simple+life+gary+collinsPDF 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_off000143f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F3 19368 bytes
SHA-256: 85a448a5662f4b8e5b743fbde5a845caec5e9e6988cf8369dbeda5bf64dba43d
font_01_sfnt_off00017576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8D 10908 bytes
SHA-256: 8076dc5be1becd6c3430eb4ba813c60ac09aef41892c079951d8fa115474ba2c

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