Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd08b5afcaeec51e…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 05:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07923306b3215dc309dc2509d20a775e SHA-1: 1ec6414546a5885afcf808443340c9ec803daf30 SHA-256: dd08b5afcaeec51eea0503af24892ddb35e1f1d969c36156dd742a6cf7f42296
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs. The heuristics indicate that this PDF acts as a link farm, with many links pointing to compromised CMS upload directories and disposable hosting. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDF documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kingsauto-bar.com/js/upload/files/18900575507.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/29452632835.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2b31dff94ac2d65052be7c458325d26/bavesifigupawifuwon.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tasajubunirufusefivumol.pdfIn PDF document text
    • http://landpas.pl/upload/file/33989408407.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/db69a40164fa7074935d9fb997335892/71794493596.pdfIn PDF document text
    • https://okazionche.com/files/vaverodasafowi.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/rukavab.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7ebjl2n179j05ri15ibp77s9l8/19864522849.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/aodjfu0rlm2ltcqd0lf0pj8ov2/zegagikejukisuvag.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/likuki.pdfIn PDF document text
    • http://beiks.info/public/file/bixisa.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/58482774288.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/nagafemetitigujamik.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/35442657188.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097088f7400f---22270358081.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbb95740c4---golamo.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/31145992758.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/susatabede.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/tazusewafewazifulepizaset.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/079f75deb3db0f2e6436df6f3ade0877/risazuraji.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ae9b0136f4856d0bd674d92f92c23a41/zegaxowodexejolixutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=internet+cafe+business+plan+template+pdfPDF 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_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 20256 bytes
SHA-256: 5a91e99eea103a5d2a90ab6e0d110e91d0fc4ea776e24dbab72f141d49f65151
font_01_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CD 10852 bytes
SHA-256: 7f357ed9f375d71d66b535e3ca5346f67123fba44c28984bdb788b86b3a6b336

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