Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fc6e1b39bf23e0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 18:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c18a169eb03ac3c57cda4f7f876e90c SHA-1: 930ab1cbc17a348c2f22654a8550f05209a09ab1 SHA-256: 39fc6e1b39bf23e0fb375c27e76cccb35eb13892895da34d88e16648b1f7a867
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to various external URLs, some hosted on compromised WordPress sites or disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://quimis.org/js/ckfinder/userfiles/files/99917029827.pdf In PDF document text
    • http://dztechfin.com/upload/file///danedufofibukebuxafevarem.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0ed449fa---sewewokobixerawenisinimi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/6216347878.pdfIn PDF document text
    • http://kalikraft.com/images/file/85014514940.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vetitobe.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99646728435.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d71cca26---50713726236.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/011fb9dcb781d2b5af1d7fe9bb6068ce/zojejiz.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/848db87c3706bfeec6e5b2d87dfb0091/71738939048.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e56056db---62275000143.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087784a40c81---13359075920.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/94c6fef6b2d74d553a174031839de4ff/gexik.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c1ef2419497391f179d99afe47125aeb/94424627436.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210816094434183.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746665b8438---xifefu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe125767a---nipisuwobetotadon.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zasugulonijugurejapim.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/dibunoxovom.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914cf6377eb---23933409150.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/zisuwofaxedu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kebelub.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/98850626945.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gajopin.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/kesudutigarabobabotetar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ionic+bond+examples+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e3ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE3AC 17240 bytes
SHA-256: 83001e1dce8da2297d1ffe7c28d25f14185fea0ce258762f8acbdcd013e0daa8
font_00_sfnt_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 15280 bytes
SHA-256: 90eb72b70325ec466dd76307d3a704c099759569394753fb645ac7bf63edef1f
font_02_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 10776 bytes
SHA-256: 39dcad8d570eaa235cca6f679d9cb789c2ffb90e25d256dec7808e11d1b23e51
font_03_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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