Malicious PDF — malware analysis report

Static analysis result for SHA-256 f014c68e9dc603aa…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a03e61949283ae02c87d5d4b46d0f8c SHA-1: f1eb57a2fd116177dcef9dc669122184f2d8a4dc SHA-256: f014c68e9dc603aa16f2f0d48ecd8fee92edd549a62a93b1daa5eadc0bfe8b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://wastran.ru/uplcv?utm_term=illegal+immigration+in+other+countries PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160760a7b2433e---gebikaveburaton.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3hi7sf8sjnt86mjb6pucu7u1li/bewinogojulezezef.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xafapiloxufaje.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607039cb69691---58055136660.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6bb03899---28771226813.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/foruxuxofalin.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6b4a595d---digafilerawiri.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928638482be---tizopenubepapijemowunon.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/23373088897.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609541987fec2---90256987968.pdfIn PDF document text
    • http://df-foundry.net/d/files/tupiwi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rimevunugamevatimin.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/wuxivatikodefekoxanerep.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503033424.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/75372407928.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c2b5b174---nigesikozamoparuw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6e55bca4---49209438384.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a254aef58d57872e65302e78cbe0ec4f/kejupifef.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/88034959644.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/71461344226.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/726addb5e66446177d5c5feb46a0dab5/27654142059.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/68cf5ilcj1rr77t97243v4sogi/jajokutedujusopetubivuzog.pdfIn PDF document text
    • http://chpcentre.com/files/file/63788873027.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/dibiriteg.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/90423405511.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6067018220---bixek.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/d7mlnci6kcpbbrvlskf0ootn95/66853495862.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 10728 bytes
SHA-256: 5cf346c4f0ef5e7061a995b84ae6df3450882c06e38a72723b6196e2c9075663
font_02_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 17656 bytes
SHA-256: 63b611258d190fc4a69234c9548fa92a4bc8e08a23438f4a72680659362d6a58

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