Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9babf26fc473a1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 02:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa696f08deecc372afd2ac75c8b815ab SHA-1: d3bb85604c68c0f7e1edf77cf12396b212dfc383 SHA-256: 6b9babf26fc473a175da19caf6ec7b3fd9ed6577efa00010f303a07350f2fa96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=android+voice+recorder+no+sound PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0ao1e8tvk5f3gp3eas6umhu4m5/xuvaroxan.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/pojupekanevivofarubuzid.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/63190080431.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/kalemigisezaruxarivesokik.pdfIn PDF document text
    • http://freeski.hu/freeski/file/70652187347.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/jimeborofejezigafas.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/41375453966.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/58012410426.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/59084233593.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/63075452889.pdfIn PDF document text
    • https://e-midas.ro/files/file/92712787466.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141521433be0---lupexerevedosabo.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210915_145323.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915175746.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/tesevoxotewajajewo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6edbbe4d2ee293ca11704e4c6cce216c/33900623404.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/xifosavonexus.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/36712050726.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/widoselaj.pdfIn PDF document text
    • http://marketingnews.fr/images/file/wosumozit.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/ganodetigidivaw.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bapadenitexoxevu.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/6197290074.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/23445169315.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17152 bytes
SHA-256: 22eb9e4f753e17f1231f6feffb08f9878a8f6fdb0766db82f214f76bda5c0be9
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 10204 bytes
SHA-256: a2776f4fc58872411fa423e2e9756400acd113332d0237baaf48fc44a94ae38d

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