Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b044eeb2fe82cc…

MALICIOUS

PDF

101.4 KB Created: 2021-08-12 10:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6707741bc58e6a9941242a738f99b67f SHA-1: 1bc1dcab8ef97c573eaedd6927f20deb364c84c4 SHA-256: 25b044eeb2fe82cc92d8be05e19372cb2539e091ba80325fe5426bed3a27a4cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised websites. The combination of embedded scripts and a link farm strongly suggests an intent to redirect users to malicious destinations, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://automozg.by/upload/editor/files/getuxovef.pdf In PDF document text
    • https://alihuata.com/userfiles/file/86070044762.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pogozane.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e201d113---25767629776.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/lemomapegawi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/dc648584160e6a755ba54c8df8ea641c/siwuluzitubufop.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/35180f076cfac38460802423f7bea649/nomonejadogovipazubiku.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0a9ca40b6aba20c9a0b3ef5ab84e8948/gesibilenokezamipugaxo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be586bc8ff7---20728633481.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2ab2aacb7b86dce653f43ea2d6219abd/60352883856.pdfIn PDF document text
    • https://fiordipannacremeria.it/file/45869293071.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f288b8fea---44465107776.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3626bd95a---xidunodinoz.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210608162312752855.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/49267974506.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/76192430461.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/92363776278.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608216ae8d069---vupigubixuko.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50956215727.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/tilolugumoris.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tkg5thgog5nk6kjm9orlm35nlj/wugedorebab.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa4a243360---lefozubowujifitikewevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hazard+analysis+worksheet+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 18724 bytes
SHA-256: 97cf239c49a6a790c056c1219883d895ebbe235d052c9acfc6103837a4abc761
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 11100 bytes
SHA-256: 7d4ff6827186d3812e3b199d274fe45dec4378316f03cf04ed62a61721a73bb3
font_03_sfnt_off00015803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15803 17308 bytes
SHA-256: 5d970f6a52cabf8e09587252db7d4ccc02857f2c0f68bfbe942d8fa92fcf97c9

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