Malicious PDF — malware analysis report

Static analysis result for SHA-256 170fec87bfab4d55…

MALICIOUS

PDF

76.7 KB Created: 2021-10-02 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 021362a37ec2ff3785bd1ba6321189d4 SHA-1: 78cd4fd68d58b1004b712cdc8cbf3ccadfd55a7b SHA-256: 170fec87bfab4d55555c913193b4b33e8becff9a2c8def4a34914ec2b038c00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious intent through a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fetogram.com/images/upload/files/72444790253.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1ab01bde---gokajugovani.pdfIn PDF document text
    • http://klhl.com/userfiles/file/pagiporibowuzidi.pdfIn PDF document text
    • https://rais.bg/uploads/file/kitozoxibijalu.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/peginaz.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/18330629106.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/11967369160.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/midekalimurodam.pdfIn PDF document text
    • http://licausi.it/userfiles/files/jifupufipozebux.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/90b07c6373d22963e921bc2d39ba73e8/18928706485.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ac86d65e---73832656839.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/43429763969.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339d521a409---16504292491.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f99bce8818---bezezamurodezakeve.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/35469199049.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/27/16570897132.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18780053177.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/91060709483.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/menimel.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/71038688544.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobuzusowopo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ruqknijk71nvdmh489jierkda7/38078556054.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xoraduditiliwakugutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+update+cannot+currently+check+for+updates+because+the+service+is+not+running+windows+7PDF 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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 11540 bytes
SHA-256: f34c0d45127372c99ca6cc91acedec725c7850b83e560b695d849044262cccc2
font_02_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 19484 bytes
SHA-256: d40b60a575606bd5792765ced8857f5da5cbf78e64ad0ba8f6c1a0af8dd974c3

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