Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75a4927c77569a4…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 23:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ff6db32046b95fed6a7be110fa34014 SHA-1: f96882495e047fa715c57c360cfeb4b14e6ae337 SHA-256: b75a4927c77569a4d24c801cc09a4185f0b0c551c8123cfe8d61eeccc6f09fe0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to deceive users or manipulate search engine results. The presence of multiple links on potentially compromised hosting indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73e3a2fee---25569506346.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc47cb7af862a47d30390af01cdd7fdd/70157719329.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/98310420436.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/69970631865.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e9f46e48bc89f400b2b5a2942c6f3444/13863362858.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/15634611828.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/81f2de7960098ffa360396c731cb066b/vazug.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/semagaduni.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e6c8t5dqh5q0aqr3amcdarnbl6/49067780516.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/xupijorabipivit.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/886a0fda21eb88af0aabac2f4c4753eb/xotijisi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161052fcfbe0b6---29065591487.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a959dda6---54795738735.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/61230260988.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/fefaremefumulubi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30dc3f0d05---3366399527.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/gozinadodotakigarawevaga.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2326201735006aa1edb827f321918f0d/55140138857.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/mezazowomapivivurogi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e6880fbc27067f17abf2d0c263af7590/natebe.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/ratofu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210622221223.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/wepalidozonobopaxikazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=macrame+plant+hanger+diy+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_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 10888 bytes
SHA-256: ba5c9661413eb77ff4366574372f89ebd994d21650aed1acf14e8e4c4abae10a
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 16640 bytes
SHA-256: 283bca5b5849fbc4303fd61f1f89e6c31337ca6a4e9e024c5d439263b6ec07e2

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