Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93a95c9a2ca3cbc…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 02:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c23167a6e8e79b6d2dfa51cddc473fd SHA-1: a3d8f69c1c69a621ae843035e2a0950bba74e168 SHA-256: d93a95c9a2ca3cbcce4800f4fd6cb03e5c60497deeb79d62d3387a9a7723fb52
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate the PDF is designed to host a large number of links, potentially for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143434d1e9e2---zovadawigokekis.pdf In PDF document text
    • http://nanopena.cz/upload/file/devukinobisumiweti.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/totunelo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/razawoli.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614630d2b29e7---mimexesexiludeforedajeti.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/94348614882.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/nuzelusoragowa.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/fabixobirep.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/muriwuxipomapaj.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/97751814366.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/49752624016.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/655f9cf891ce01400a47ff272c5413b0/82239471665.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/84934857746.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xirirejojuxaxuri.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/22452450069.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/webubuwi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b917b583c---24440241915.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/75367764698.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/79583582085.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85961913829.pdfIn PDF document text
    • http://alkanboya.com/files/file///gibowegutavakagezuzuvota.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/85994138146.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/vazezako.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zejofenezoziserujimosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+sapphire+codebreaker+codesPDF 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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 15228 bytes
SHA-256: 0f620ede04d209d2ebca904b2bc409333a1924e5a55f853b0b1f500da0ae2f27
font_01_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 10868 bytes
SHA-256: 095ab31bf4753428625046fef599d74b7ab8a336496fd74fc34be5b5877a7056
font_02_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1