Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca9ed71bf906b5d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-15 10:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6c1def4ce9ca4b49826b62c6931479d SHA-1: c5e9cf0b1ed8556754c53adb77dfd6b56d4a4865 SHA-256: 0ca9ed71bf906b5d95780508d129126fe728683a339539bd73d0ed9ed0c2b4c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, likely intended to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal appearing to be the redirection of users to download additional malicious PDFs from compromised WordPress installations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6d826022---buzibodo.pdf In PDF document text
    • http://lexus-custom.com/js/upload/files/bokisifo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/84481152385.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/16762778243.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mcpgeqciems0qcm6banr0hias8/jemifadutegagerusesadawo.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/10671366798.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d49553a0e825431741f9170f9a6178bf/gukototimukotefapot.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5f1d5d88---vodatavoxabelupatuxowute.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/ramozewapesazofi.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/sizifumomagesalir.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa1981663---10636524664.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/fidobikuwugawo.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/lujikejenadu.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ff5232d2798e8008bb443536f45e8134/joxarenonunuw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0900d4548---67861731633.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a2d3e224---tuleralofavuter.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e431ee3b5f---72619049946.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/81k236dhiuuefl9idgqjbtk852/fesudesomikuponibuwofevu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768708e4734---xaxifibabak.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/1522085838.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/bajedonu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/55g2n4obkioe6iqi3214n3pvh4/1563181414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=food+handlers+card+test+answersPDF 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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 17168 bytes
SHA-256: 684421151a31095773058188bd85bbfcd2072d3855f7cfb0a2457a0aaada4ef8
font_01_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10436 bytes
SHA-256: 4786640a7a50ff8211e0047160c06db6e4ea825824da910e1fbec67087fab3dd
font_02_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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