Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a4a1624f91d3a1…

MALICIOUS

PDF

229.8 KB Created: 2021-07-07 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45b67e0fbd06875993422b3b175a1e5e SHA-1: e899a6866a524de77132653c693709c1f72ae412 SHA-256: 11a4a1624f91d3a153361e0c2d3478c7f61a1240a0f46201b6aa9a86b5553309
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and links to a compromised WordPress upload directory, indicating it's designed to redirect users to a malicious site. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware delivery vehicle. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cafeau1ait.xyz/js/ckfinder/userfiles/files/80548719638.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jewiwekisuzikoja.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a83502c555b---42323729659.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad17e3065c---sebagereritibivibumilipe.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/2637004355.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/cdb72ceb8c74430b62ce251ac6b08e7b/foxegimuvanowomogixapi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/50035000990.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035994f164---lovisiragubifeweguruvos.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/66791362791.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac0696226---13799696112.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e54926657dc1902b3bf45e1fa56919cc/zuxufupabumolepewelosete.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5486746c---8446133435.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e07bf96efc5c184e4c321e4a22ed111/34624493831.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079547b02444---57546989365.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b0aaba82---buzamujagikobawokan.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/burepunafoju.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608285c523643---nogakapamosugugolivimod.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/wepivirip.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb74c906d4---zeromenoxowaxemakikawe.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d64a5cc---94818765210.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160932aaa5cf7b---71177731578.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fb71c21fc4fe4ffc4bc4939a551f589e/tizopejazup.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/maweboribezi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/96275552831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=path+difference+between+two+wavesPDF 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
font_00_sfnt_off0003061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3061B 10820 bytes
SHA-256: 7d6f1ef784e647cc220954840ef0041dd7c47762ed448b008ad51ab99a397756
font_01_sfnt_off00031f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F10 20252 bytes
SHA-256: 8a1ffa3bf5ceff4cbc38b4ab21520cb0c2a5a08f638e711a2485263ece59b867
font_02_sfnt_off0003536b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3536B 18112 bytes
SHA-256: 14480dfffeb2f1bd17fb4804ab30d5c591fcd2aa0b08699bef2852578466b67c
font_03_sfnt_off00037068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1