Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ae1670dc121d98…

MALICIOUS

PDF

98.7 KB Created: 2021-07-13 21:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b7669ccf182886196d8441df84f3ec7 SHA-1: 9308038a45989c39964893dab67f33008b9f266b SHA-256: 04ae1670dc121d98eb6a1f4bc9996f5cd93a476b4536451f3e95b7f78c12c422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cructi.ru/uplcv?utm_term=philosophies+and+theories+for+advanced+nursing+practice+pdf+free PDF link annotation
    • http://wecans.net/_UploadFile/Images/file/kevapaseberapasikelabe.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/41273579144.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a32189c2f---83405857691.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/keverukisimaminokinewewoz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0473e6ec---81216604907.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b143ab99f4---87565088345.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab9ca38c04---29203074900.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4c784a9e531caa87d5668d07e47992aa/47645095830.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kulesejiderujej.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6c9f3282eb284fe20dc4cd4bab6dce26/1908428278.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087127f5ac7b---begoxatukosegedosones.pdfIn PDF document text
    • http://ipllaser.in/uploads/5098185124.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/24914135589.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/tomejowutowemagonewujulu.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/25951158822.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/60436831466.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7cfp80f4jhjsaip3c8kbco3tr1/zulurofawuwedurifap.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6f8c56ddb43b552ffff6b3a0ca830115/27761596481.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974a17c4de---gufezufevaxu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbdc3203b---zizepuligodovitalumaxupo.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074aace1c913---35862157942.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df345b622b---7001431836.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_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 11068 bytes
SHA-256: 846c44c4e41062da95c54eac29690422620614fe425a207b193f82e595fbcb87
font_02_sfnt_off00014eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB1 17532 bytes
SHA-256: ff14f08d9682e9507960fe66d4a61aa57195db036744d57561b1072cbf9dfda5

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