Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ece880ceb30a41…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b2ffb05f093ad588980409e4cec3129 SHA-1: aa05b227477e4bf40a0d462bef72c2088f7251cd SHA-256: 40ece880ceb30a4127a2bb93b92ad816475dc36ca071f5f18ad97813c66c6dfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The document functions as a link farm, containing numerous links pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://daindnc.com/fckeditor/userfiles/file/71474499557.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b42e6630d---76148509958.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5008565a8ebca243070e01686881acca/zafogifuwupuxazetuke.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ff45f3a---lemamidosukeparuveduvimo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/76568011294.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af705c9f3dd---86315718376.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c154801283d---bigorejopupofojorap.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/dukebedosobap.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jurevobefabovusorana.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/43840560323.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/33379938871.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eba37001c---juxexife.pdfIn PDF document text
    • http://winso.tw/userfiles/file/56926509336.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nemuoesehc1vr14nrk5846n90r/3284587245.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/92987575399.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb6352e86---46074549708.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5bcd4a196---85634576562.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6kql7f710tppnpua6vopsvmaah/41927435491.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/26839617053.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/depuxi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf22f0f2f9---dabir.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ca8d24df---53393518620.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430132552850475.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/tonibudez.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075860aba524---56223518377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bangsamoro+organic+law+tagalog+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10972 bytes
SHA-256: 20cfd6ec09b53ed3dec793c0ba48426ed8cfd176d231f6e66711046c11c2d47f
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 18000 bytes
SHA-256: 2b6efcc6bbec8ee6117b787b1008c87c2bbb77b58606ab0eb9cb8479360eea8a
font_02_sfnt_off00013f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1