Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f03a597688541e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 16:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 580ece35d4d34297eb337714092b95ad SHA-1: 9d26f01562c15fae0da360bc9e17c4666d4d04a9 SHA-256: f1f03a597688541e1977d7ba5abf250b554b8c451d4c6d71d8e6fdfdd0a71fd2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to download an archive, which is then expected to be opened with a provided password, a common tactic to evade static analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://laborke.ru/uplcv?utm_term=solid+explorer+ftp+client PDF link annotation
    • http://italianopizzeria-pg.com/uploads/files/85762967154.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/78064084999.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ketisivevuwobolusukut.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/10034135852.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/78732330923.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/46482742170.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/jusakusupofimepuxubew.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/44448509571.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/11686553213.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/67987070454.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/93874118460.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/renikubaviwazuwobubafopub.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9b50b7684b4fa2d3ca47a1dce2cfbe0e/lepoxerozuvezaxe.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/xakomodipidixisejof.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59902964629.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/82432009646.pdfIn PDF document text
    • https://rjpexport.com/files/62423869416.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/duvakigijofidudigumozig.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613491be4c3d6---vinifevofefuvilo.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/fimodizutagavidagoga.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614062deaf801---66339308643.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/35837214781.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/banedudozan.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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10460 bytes
SHA-256: 32d177a41837a47d763c45e1a5610f607b5adedfe9cbeaf3def444845d722b89
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 17264 bytes
SHA-256: eec9c604f6051e6824651a3f2cd4ed5501fcdc50a342da3aa57f2d98c23c9bcc

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