Malicious PDF — malware analysis report

Static analysis result for SHA-256 597bd309a16c05fd…

MALICIOUS

PDF

92.0 KB Created: 2021-08-16 15:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1e03646f1081acbd40b0d2d4948c346 SHA-1: 454275ce0b714129afa6eb70898e9e9515cc9a37 SHA-256: 597bd309a16c05fde6951e5be651506a82885566b097114574992a0c8d45bd37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16117b20e592ce---51985427109.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9652173d2---31564991133.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecaacca3---natezopafogafigafewe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0fa0fa74---govav.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14971997462.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/34753718623.pdfIn PDF document text
    • http://cga82.com/admin/File/2038912110.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98ed3595d---30336913687.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e5c14e9c57d42a71d43f11575631d85b/63164943654.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0cbb9fdf---18312262388.pdfIn PDF document text
    • http://veivel.com/userfiles/file/basagamewejokawinilifozi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a408327d871d336fd61aa7ef80d54e6/vawibumajagezej.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/12040877120.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/97212155460.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610122cd24d99---96869131216.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/vewegejujazep.pdfIn PDF document text
    • http://afro-safari.com/upload/files/wikonan.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qct65l0tln22ahoqo9aomcrkc3/nozetavedujojutaxatedori.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nugowirazaduk.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/83589136887.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/rubujoz.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e861a604bd72f252ac2d7410f0a9fdce/22521571792.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ph329a2n4k9h6sas2vkf4ml3o0/2340390518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=total+war+warhammer+2+lizardmen+building+guidePDF 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_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16748 bytes
SHA-256: 747efb28af3a2934866a5037a8414e4491aea1a606a1402473b2437de0b5885c
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 10996 bytes
SHA-256: ec7f638070edc92df6edba87cc0886bf3a12bf2cfffac5e94a2fa19c65aefd9f
font_02_sfnt_off000147d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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