Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e8038b69ef7ed1…

MALICIOUS

PDF

62.5 KB Created: 2021-09-18 13:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c36da9fb6532e81e51498e0fe97f095c SHA-1: 597f3c4728b8ca1afd6ff45f331249312cac98e2 SHA-256: 45e8038b69ef7ed13d3cefb73a79d363bce8d3f7d17bbfeb11892d65c36e7c33
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though obfuscated, indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9091

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/uplcv?utm_term=share+my+phone+screen+to+my+laptop PDF link annotation
    • http://mariopresto.pl/userfiles/file/84451180950.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/42335407868.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/54957257836.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210909223421.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/98849547880.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/tetatimugifolakuvuzuzodi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/15585717814.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/62822317974.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/dorawakovan.pdfIn PDF document text
    • http://tabletopad.com/images/file/75248801389.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d51319bb6d53798adbe79b1052b0bceb/92443170632.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dmalknkf4vifauvvmqsuje3jmi/66828091362.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/28106609661.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356014bc052---63298498618.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/44903300362.pdfIn PDF document text
    • https://fong-cai.com/upload/files/40184300579.pdfIn PDF document text
    • https://12shio1.com/contents/files/38102699123.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/xekurewufutidazobim.pdfIn PDF document text
    • http://szjg.hu/images/file/puberefagedavuxitileti.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/96407169697.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/zarujoleb.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/mitekasazepoxerenufavutem.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/60862384899.pdfIn PDF document text
    • http://ailizia.com/userfiles/69338722576.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350e2ea3410---36942954071.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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