Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4201beb99c42782…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 08:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0c10a634cc38730262398258f820cef SHA-1: 91f7427c56e6c2b9efd70466a32a666f123cf8ae SHA-256: b4201beb99c42782cdbfd16e5fd30dffaa4acf85355111157da1bb9808561cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=best+fb+liker+app+2020+download PDF link annotation
    • http://duancanhotot.com/upload/files/rezivozukupudewatap.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/63655048332.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f3297eb76ab625fc6d729910090f8b68/borataba.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/4656071313.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/mowimaboxukazolofexinude.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xotabujaza.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/47814500334.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/12850942228.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346bd98f425---21730057006.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e86ae669---56626773996.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/53411816193.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/99732950933.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/38048555662.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32262054392.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/tilamedeluf.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdfIn PDF document text
    • http://zuche0551.com/upload/file/2130854436.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2a42926c160f6982c50df99c37b192aa/fiferuporufomuguxupug.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/35846332081.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/60478080191.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/suxodudagaxelifibiji.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/98841565912.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/65436723236.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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 17636 bytes
SHA-256: a3647df61a565ac499a2faa9571c863ff6eb638273e290e09fcdd6f82c864e7c
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 11104 bytes
SHA-256: 702388b32280c4e70cf0f5b98ccb18ad6cf9708b28cc4d8a6bb04ed8a81f4e4f

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