Malicious PDF — malware analysis report

Static analysis result for SHA-256 3864d065e5ceab9c…

MALICIOUS

PDF

89.5 KB Created: 2021-08-11 23:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d65567e7596e132cf85af33916a2be1 SHA-1: 321e15f6c327ff449045ac4bfb40505d2e9d9f24 SHA-256: 3864d065e5ceab9c9de8e629363a85212a331c1113215820d4b81a55f7184aa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://narnivet.com/userfiles/files/tewimexisejefefutawuje.pdf In PDF document text
    • http://trimblehighalumni.com/clients/84492/File/62701125563.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2m9bc0j29f38louqb4ka3dddd3/78414140959.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fa74feffcdecb3da78f9c74f210c0161/xajiminurakekotinot.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zikogedolufazawozuki.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2a148479---752141657.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b43b9d96524c56975c909ad844989be4/86153276555.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/beroneripukamoga.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba2a88ef2---lituri.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/24011203619.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gizuzalawubewukorubudid.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/009b71692d52c4609ea784b88f9064d1/xaxitituk.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/12ef7f46339573631c15e87a64b1ab1b/zeximoxoxifuwonasam.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28b63efe5---62531892104.pdfIn PDF document text
    • http://olympusflights.com/files/files/57860745528.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f452592b---bivabegorum.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/14350125440.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/mekebogadezamozokeveseteg.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fd618a60---1665716957.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/14786328935.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ue8knbc96n59ro7qsd6i7naqeg/mugejonebibalale.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9845b8f24---posavilipiwume.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e8b34d5d---45369083040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+peg+perego+siesta+high+chairPDF 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_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 17700 bytes
SHA-256: 4ec64831b409cb93c36db1d46809ac392cd2cf392618a9ec672f4ffa2b67cf64
font_01_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 10684 bytes
SHA-256: c79b427c5569154ac975adedc366b932aebf43d49853b9a90e239bdca76f6239
font_02_sfnt_off00013ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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