Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae2030496cb352b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 06:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c19b4f484078ccaf48f347c16fbe09d4 SHA-1: 66b5981706aa2fa26f579e9b94c2a1259e7a7d0d SHA-256: 0ae2030496cb352b7aa674f950b229a6e28007d14d4825c4b7e49c018616000f
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 disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on potentially untrusted domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://fuku-zou.com/userfiles/file/bodavezuzinowixanor.pdf In PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/rigawofuzilowuwakuz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1aa737ce---59608097575.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/34546115790.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vofosofiguzemutijaguw.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/75019086956.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/5080331900.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/26201603754.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/madojudapigudu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223c7a0cfb---92053746115.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/5108261950.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/32195226715.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ba5d78916cb3ed2c1b2155fc33d628ec/pajapivomuniripef.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/87187176639.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a69284e9194771e1c74eb814bcd7c362/34775304863.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/netapavodasobavovo.pdfIn PDF document text
    • http://kasand.com/userfiles/16915298135.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/zolorujikitijisad.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fd481d7cb89---50858804811.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb308f523---dutirifewaf.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/90367442584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+cuarta+dimension+pdf+gratisPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 11112 bytes
SHA-256: 19cd5159beb17f677267475e599c2aa2d0700e9dbf7810f484d80d99d3fe9a54
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 18588 bytes
SHA-256: ee4eb5563a560adddf014d3357a50b144d55203d26f01be02737eb0832ba04f4
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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