Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8286f81bf2b3de…

MALICIOUS

PDF

75.8 KB Created: 2021-09-26 07:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25cbbd2fc40d05b33eda13e2d6009ff1 SHA-1: 56dee86f5d2356a58eff6a28074573f4d8197ba4 SHA-256: 9b8286f81bf2b3deda0d4d162c265eb12cfb83a81848ee66ab672005aa2880ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users through compromised CMS uploads and disposable hosting to external URLs. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/md9ms87ipu1ujd6mee4e2q4ffj/vifenomovidoxubarojumogar.pdf In PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kelodizuxebefumupofufep.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/251aaa2cd16b6c68ddcabb856ad412ec/bazotirimasafa.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/23130881308.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/binaj.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/siropori.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/17141069264.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/78385802935.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/63274366500.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/fazutofalez.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/41486290084.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1bcaa43db---xadejovamesirexemakixuwiw.pdfIn PDF document text
    • https://derfo.info/resimler/files/tomirubometobetow.pdfIn PDF document text
    • http://fgosvo.ru/files/files/rowusitewufavo.pdfIn PDF document text
    • http://geotersrl.it/file/35629844623.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nodasudireko.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/42771277366.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/36089311217.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/sevedibuxaweba.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/27826647053.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gojunigujaburugopetabu.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/5706938151.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210906185247.pdfIn PDF document text
    • http://epplast.com/files/file/35396854856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=j6+plus+flash+filePDF 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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 10292 bytes
SHA-256: 54b2245bdbd59a8457e2a7d35160b824bb7505c9c394d94b234ee1ba28cc7389
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 19632 bytes
SHA-256: 902e6d19e8e8d77e1a324ad9032da4c6990d921e88e301c0364058949d6003a8
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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