Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1bb74c4785f951…

MALICIOUS

PDF

104.7 KB Created: 2021-07-16 07:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 246219fcd859c2dcdba3e6456d82dd19 SHA-1: faf67efba9686dcdca624828ef12a994025de028 SHA-256: fa1bb74c4785f951ea39e237e2cada51646aaa26119f398ee75fec18ff1b44fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://nomylo.ru/uplcv?utm_term=who+wrote+ecclesiastes+book+in+the+bible PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3ce6v5l6m0v1t4gd9a7kvedl5/jajizovovufidirasabopi.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nabegurabana.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/gesowaninoz.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/58820799122.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f517d71cd---gasefikimapifugikulovofos.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3ae16c9f4de671de6dcd5f8435ef88c2/pepatupenixunafulezezuw.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/vilizakojeg.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/69400435055.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094677e7475c---84492130072.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lrs39mrmdi001p1giiong5mku0/fomexifuxafi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce6d2795a---fimozopup.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/559977d0e206ac17e1de2613ad4c5c27/pexelasafefunipeberan.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cca3850adaf6b23da119a077af926949/xujogidulelixepidofunuxu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c1ccd3ab---64882786089.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804063bd0e5---detakidejidakalijut.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fqn8buodb9iu13rg04988k6lgu/9927099269.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/mipuxikulikawe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc453a551---podurewonivexarowidixizin.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869afc0ee86---paramabumatapebosikij.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/83167424342.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vakizesamapimibawikoz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a9c73064---2020663598.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9d3d41e8a9861fa15a847adcb98b34c8/sujodemosowapekozale.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10636 bytes
SHA-256: db026b85a7694bac87721307bf4c172aa9b30f6534a66ce233b03092e3bba73c
font_01_sfnt_off00013a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 16428 bytes
SHA-256: 5387299766160187fe90508d3aa5f66b1f7a9015126263b659692ec685baf8c1
font_03_sfnt_off00017cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDF 16816 bytes
SHA-256: a511171dfb15981e2c130a54b312aedcfefb388787c8014a918938e6eccefc15

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