Malicious PDF — malware analysis report

Static analysis result for SHA-256 323174ff0b6c13da…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 04:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e70e0f6e5721b9bab825d1c5b0055460 SHA-1: 37f9c163798c36eb5c6e23d6d496a8ba93d536dc SHA-256: 323174ff0b6c13dadae10e08e27b1bd43504650e56542d42ac6fe83ec176bc5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://etimes.mn/uploads/files/bafijobadagotuma.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf40ab2c41---dofufipulexovukajinilo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488a32be5f---tonitojepexigujag.pdfIn PDF document text
    • https://maisonforville.be/documents/file/59545189140.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jaridanagoresunaxu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jba05r64tcd847l6a8t7narsb9/xasaki.pdfIn PDF document text
    • http://dzbnf.com/upload/file///90356832355.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6ae006a278d908b03b9d07650be25b30/mefagafoxisoxovoze.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1e641362f32b3ae4b8cfbc4f3959c737/tubulozurakugi.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/32649838261.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40847855495.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rezerutu.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/5661483856.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/74e5778e47644b633b09deeb21266b1b/sobanam.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q5jtbc4v13sdr8fj42mrguqbg0/15090646017.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97123afe175b68ab79ff0c340512b62b/xomakituseririnub.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7628e1810bb0ad19eeb3bad76d931aee/totobijogi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bee86074---jagitugi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6432f17d3d---sapuximugo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/3jdclbss17a3aenhgjgj54mmk4/gigasupubumosolimadosir.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bec027765---83133686071.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/kumomuzedonezomem.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5658c3fb90---wutegepaxi.pdfIn PDF document text
    • http://akssert.com/userfiles/files/19847612720.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6035d62e---59185628198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=still+into+you+remixPDF 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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10332 bytes
SHA-256: 9919c1fc67bed02ca7b12bceb9ea4a829f853e089f7797dccfac9bdd9504d8d7
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 17640 bytes
SHA-256: 5a4cf8d61f930077ea4c0dd5641b1fc5501037ccc202b095862280aafa61e322
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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