Malicious PDF — malware analysis report

Static analysis result for SHA-256 6758fef413e5673f…

MALICIOUS

PDF

107.6 KB Created: 2021-08-08 09:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57eb06238218bbff97d25699d2d879e1 SHA-1: 978d3c719b16fb8261b53ef46cfe8c7aeedc38a7 SHA-256: 6758fef413e5673fcd50aefbe4c4697fe9c330cc8f67e0f0ddc54b628ed8d3dc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a lure to download further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919eef79f8f---6535219493.pdf In PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/kn79rr2s7bngbs9kctp9iqn7j1/45972854524.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/teligurikogujul.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9d606c2f0056d8cdf21e6b9bf62eb86/24706349465.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/xelutedew.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/9435492769.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/zibefaxifabazi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a15c4fff---zumuvabafove.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6d485dd88b7eeca4d3316163ca0af69e/rimikadorifi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tosemokaxipetagepodosod.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbbd470f0---surubabofuribaxubutapona.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nudabugimag.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/41275725448.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070e04cdb80b---ganusesavig.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/46716997571.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/gerelifupiwude.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zidagudazi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609066c72c633---98851232387.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210626_4908959CAB67598F.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/29688437648.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c20f59b41---jikevev.pdfIn PDF document text
    • https://slide-bearing.com/d/files/59405029981.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/95777259728.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/pediwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=acpi+hpq6007+driver+windows+7+32+bitPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 22816 bytes
SHA-256: 15f031fc71c5cb99f5fabe5cdf6852abc9e2ce325bc14fb39f8e724b12fef762
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001586c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586C 11452 bytes
SHA-256: 199ff23fd43c0fa16ebb9aaa483be14fb4365341db6407ddc64a4351c6a4dd69
font_04_sfnt_off0001732f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732F 14500 bytes
SHA-256: ce2a1399e8c9f47fd99e57a40e5f57952a5c88d68948b1a2aa6faf38f9078f95

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