Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fafe6c6b258168…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 12:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 349e2ba77c58c4595a90a96506055f17 SHA-1: beaab12674ae68e9ebcc454fe10508142cd29704 SHA-256: 57fafe6c6b258168983b04122eb987fa4c8ecda11dfd3b47b40dd3da75829db6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting an intent to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=android+wifi+keeps+dropping PDF link annotation
    • http://unewstoday.com/task/userimages/file/17119925147.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/poxununa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3a17da6---984743745.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/63638547104.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/mikaxumupusizu.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/29852636057.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/80977972463.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/57828379921.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/17327407116.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67dbe4f7a---67296454167.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/47355956435.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kenavawazagogasom.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/dagadeze.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109100818318127.pdfIn PDF document text
    • https://dm288.com/slicice/file/guwutodivasugoxixe.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/tumeginijerozafotatova.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/bemumuxamixipinuj.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/87848569326.pdfIn PDF document text
    • https://ebooksweb.net/files/file/joralukolulukavuvexepox.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27cfdfe09---sibenavirajiza.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57083260426.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/88345749569.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 17948 bytes
SHA-256: cd8fdc4450df84470665cf2071ae7acccb43cb1726255245fecce3d2f48ddd17
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 10524 bytes
SHA-256: ea2e0bb68312758701e220f7007b5caf177c01dd2edacef3d45a923fcdfa8faf

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