Malicious PDF — malware analysis report

Static analysis result for SHA-256 189b85be1cdc30ea…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 18:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb98751545a2b4c2aec27d49fc418bf4 SHA-1: 364fa4e20f95f1b6e4fd50f8fb1c464a746d3941 SHA-256: 189b85be1cdc30ea4267647913a2d39be9862c3f51fc82f96d3e6f390f9abdd7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, likely intended to lure users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ketchas.ru/uplcv?utm_term=how+to+hack+android+phone+using+same+wifi PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9etnhg7gh7s71i6oje8mcahm2/kavunabokirifarifonisad.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/memevirakaxobugem.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fb8d6ea54fc8d9f5b5ab783fa87110f0/30264333337.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/goraxu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/pamowepilobewefu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/80214987609.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/11289678868.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/79292384298.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/50753096461.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sawilupebo.pdfIn PDF document text
    • http://hodori247.com/uploads/files/41118641610.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537d22d20b---palikunotezumojoderas.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d414415794---23264258395.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/41648002218.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/7993246283.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b8739924---19992477306.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d4407d80---muguwokoxatagagoruweru.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xitezoxelogedotonedox.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/12804692539.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3abc820abed9e132817c50ed57f5628f/gofimogixipolumabuwokisur.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/39414206221.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136419a97fe6---luxekaz.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/54953778318.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/22370271031.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/pimuvimovodus.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/89961698501.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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F81 11288 bytes
SHA-256: 481d06361e89c1f39fd0ad2229a61ddf4630c9732d5d4a05134ff686cc1e86dd

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