Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb555a5cbdc8fea…

MALICIOUS

PDF

104.9 KB Created: 2021-08-12 15:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ad48f73257b6faeebaf4ac1d8631cff9 SHA-1: 581688260b4f471c6437295c53fbbde4482bb00d SHA-256: 9cb555a5cbdc8fea1bb85c9d642ad7e363aa0a5e98685481fe234eb92b214548
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=is+arma+3+single+player+open+world PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9737fa7ef9---16242191038.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f1ee306fd14435375e9e00e8780cc6c4/zikodawif.pdfIn PDF document text
    • https://kawanmto.net/contents//files/81681983266.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32cba276bb---ganuzovoso.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/pedugonufofotaxenusamon.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/65662666858.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/dasazafipefemu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab2bb5b14---koxujoxeme.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aa27b760f68ac7244ca3712bdcc23e66/25242683346.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/624f950761ec2b23ddaa2725a815b4fb/dorosemekuxuwapopusi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609debf795d1b---wifefovokibetadun.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/47287393630.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b07875916155bb000a04a949972870c/94434905446.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/lilubotaxube.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/69686769236.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xijebumaguvibix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d9c373d16---miwofuf.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbcb7c11367dd25ddb7257bcf11e4518/95390859755.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3b19897188f3b778384eb999909bd445/zesurimakixutivinefebibip.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/81563d6d84c8b96f1f4c84f332653f25/15073398197.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5d309aa0bbee30d5184c9e1ba3cdcdca/rurevizujatener.pdfIn PDF document text
    • http://indemo.pl/Image/files/83163588618.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e63637ab61d---30309531504.pdfIn PDF document text
    • http://netflor.pl/upload/File/dukekonowajewusiraditofoj.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_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 10960 bytes
SHA-256: 83e31d44bd98b49e199f141ff6d2b680ef511f578ec63c8b3c1f4ffbfa625173
font_02_sfnt_off00016365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16365 18984 bytes
SHA-256: a4bf4bf10fa749d7998099e316855fec2712935666239bd8b27603cf6829824c

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