Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718573d2fe66506…

MALICIOUS

PDF

80.0 KB Created: 2021-07-27 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80349fae01f7c619e9303557c4f4c71e SHA-1: 89c73c2ed1a6f768a3c3f66aeceb989ac7cfadf0 SHA-256: c718573d2fe6650606d798003136bba084cdbde9d569033056a26e3e575dc7a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://cobansut.com/userfiles/file/vuwawivikubumexetofire.pdf In PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/vbv2dh4h0ot1g7jo9q6fha55oi/9952689479.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e85ce80f1efb4b4d0038312b65eb549d/65665376255.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5dc6f871fa6675c0a8225af4478f6a75/wuvapuwuva.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe284a1bb5---36262064488.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/7790622298.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a58dd99fbcc---vovesojotufos.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1702612e4cfd19a6da03921f7bac028d/dupanof.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/60636023658.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/fubinosatit.pdfIn PDF document text
    • http://promador.pl/userfiles/file/tapiwikiziwedax.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/joguvogaliw.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/zalimi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ccv6rjevoq71j7tbth36nf5bao/mimimelizubimofopume.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dbdeb50---18485016637.pdfIn PDF document text
    • http://freeski.hu/freeski/file/91610000049.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/37856171336.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/43070851498.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaba333c2---90984927284.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42d297ea7---vewurapokulefete.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78657223477.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ecf2b419cdfd462fca50abe61658ce61/71997073569.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/43971970523.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gg5ptieevl24q9irvnbik720s6/garugunosewifek.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/89216127972.pdfIn PDF document text
    • https://immobilgold.com/file/gakuz.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/70752411088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+happens+after+notice+of+computationPDF 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10792 bytes
SHA-256: 691aa6b06742fbf5699a9847e443c47725842e09bbeef8fbd2023a04c2c1ec50
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16412 bytes
SHA-256: 810313aea4b422149ea73a4f63c30de3d4aac05c739dd8124e5297770e6b9193