Malicious PDF — malware analysis report

Static analysis result for SHA-256 686a1e5d46e7d2ce…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 04:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15d254819a883e7c0ace1cc9bdd37b6b SHA-1: e0d40d70d929da3d517e0579f4bd1fbcbdd575fd SHA-256: 686a1e5d46e7d2ce2473980202b5498dba8dcdbd1094a7f2e3d5c6776b3c43f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of multiple external links and the high confidence detection scores indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/973cd8ea8f0c559a7d63516ed80776ce/30576468029.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bf268f54---84223119699.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff0709c5e---xixatiwof.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/pedijutavusobol.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62a259bab---rirojakutemofoxo.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/girimivodopakedogifumifa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2ec0845bc8f3a5093d46eb6b8b6946d8/10940652199.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ceba4b9c334aba6a1a02e4e9c4c0088e/gilab.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/26398133054.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d022981f35d59af1263c38c4a32b9515/newepodilosusujutofiw.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/25773c41f2ba208c46adcacd69d3d9e0/42541329990.pdfIn PDF document text
    • http://mega.kz/media/upload/files/71785877333.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8773024a76b77cbd6b3084e6f2cda47e/wonavarabipiragober.pdfIn PDF document text
    • https://btegypt.com/file/63004802219.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9hnnosumu39sj22c8bnghr8h0g/91995377312.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/devutegomejojatuw.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/52350601227.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d27443c3af---50370776170.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mepawuzoses.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5ba05d26---27717781617.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/12499091067.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/topibufukutifi.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/vekedubosezafofukiwal.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c861a23ba7---13344367072.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/68428051229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=culture+and+values+a+survey+of+the+humanities+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_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 17384 bytes
SHA-256: a53be683df31285917a0f8b9cbccf7cf8e9cf76371e2b997f04a0aa3dd1cd376
font_01_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 11076 bytes
SHA-256: d797be83313e78518de51c6b733159b6b7f466f2c3cb800311b7e2cc1a18ae5d
font_02_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.