Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c89b3470595aa1…

MALICIOUS

PDF

105.6 KB Created: 2021-07-03 20:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2860881c811224a5d989cc3b5338d41 SHA-1: 17dfc9314ef5547c42d5c5134ee912902247c530 SHA-256: 84c89b3470595aa1343b6a8faa62b07f8844f4911e59413ebab39144acd06a84
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ca7c5d4a23483fcdce7ec764ffcbd622/73360013707.pdf In PDF document text
    • https://limsurdua.com/contents//files/zupesakaxusujajavizonugog.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eec0357a7---81397817099.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/030b717fb262961b3a2a9e293a9d3d1a/94655209108.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf23de1f45---sojadupanomewuso.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098aea45f0bc---76371818421.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5rcga4c5d30mi34ejmud68rmb4/gidosizunuvepofolaseb.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/36893737814.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/41559679318.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/lapugovadonupedileve.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/55994906063.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13e90384b---loburojedezowesek.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/782876969.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d818a3a2b---85167070262.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lovefolunulijuro.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f26cf73c---24313104518.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ac3d0add62595ae0c2f3da5c8523c145/sobimeginubolimisogogetop.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747baad1f06---tebiwimurivoremo.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/65700915666.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/725582c2d0b8db0511a600bf565e7a3c/69148654054.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/39285736620.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/52900172556.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/437b0afd82694bc462ce0bf330d14c6e/12148302454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bennie+and+the+jets+piano+letter+notesPDF 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_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D2 10672 bytes
SHA-256: 24d35882008c672f4e4c44df51284c462790af2af6b5c4f495c62e30c17c2757
font_02_sfnt_off00016b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B23 17864 bytes
SHA-256: 1d4e1c265826e769e60fbf7fcaa03439804f7826d5c5fe72a637187eb30ee5b2