Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47fcda663a2c04a…

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a37100218e120cd75cf18dfdfd0e1f3 SHA-1: b9e0f7bce00cdcee8ed06b5b2d1cbb23e415d7e7 SHA-256: e47fcda663a2c04aa5aef63797639a1b5fcbe84cf89719170c349ada139d4c11
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or phishing for credentials. The file's structure and URL distribution are consistent with a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • 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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3bcd56ab---66422995039.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0e897a54---72967990537.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/dikibuwidodus.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aec64ce1f0---zebiriduxazir.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/begadelirajumodiket.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6bfaa5b43052632ea6d22b3c88c15ee4/nutarozonagosurifi.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/sudosatok.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1f3659a44af1314b2a68ea33ad1db0bb/77719048014.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0af777b9003c8161b96cf1f9799b220f/69040236418.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wovewivalenepelosipa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942571a2eb3---77620228023.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/supizedulipamox.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/53670824609.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/matuzimuzavolisagakuk.pdfIn PDF document text
    • https://arerp.kr/data/file///diruzederuxuduv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1112cc22fa---69058664812.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltfgi9r702ck1fr4i8hormjmhr/8232826550.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105598c8a182---84924258806.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/8857502765.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/6753553671.pdfIn PDF document text
    • http://abnicum.com/files/file/1849206749.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/wojeteziboz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fc0ou01gsp1rrbqm7okhplj097/14852915627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=extension+methodology+for+transfer+of+agricultural+technology+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_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16520 bytes
SHA-256: cab9b80acaf66d3e85018ce4c63de10ae723019ca542f14083f242bcb62fb43b
font_02_sfnt_off0001462b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462B 11368 bytes
SHA-256: e3d749c2c2e8466ddb5de8ef9e2ec418a2e95feaf68419a6a2116ca6ea2e6342

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