Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b029366e7086ca…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 15:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22fa8e837e27f6ecf1e265ac876bf2cd SHA-1: cc6e2f377d50f23d99dc41bc8e626f9b6a767bb1 SHA-256: 71b029366e7086ca6dd5f8d6def471b38e69add52cb84f8b422381cf11a770b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of external links and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=changing+storage+to+sd+card PDF link annotation
    • http://tinhdauvietnam.vn/upload/files/45546702690.pdfIn PDF document text
    • https://deepex.hu/hirek/files/5911845536.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/padodezejevi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/26783127226.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/bilezapabesebaboged.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/37315520417.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613165d11ca26---pirun.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/nedimukax.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/73655607130.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/28959549208.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/zemabojo.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/52250743708.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/48821245590.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/vilupekimozufij.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f31e3223685cf79c1b97ca8e79cf6c04/12491140884.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/xavojogujijegeparirer.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/peliridamifinusokaro.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/25133123053.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/55192077666.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/jozaxoxirifijinexuxesuf.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161439f00c9ab4---manakasomapujanigujazib.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210913234637.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45b7d60b1---fosifuko.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef08044267---gilemimadulemozorabukef.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/dunapidoxiwa.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 19396 bytes
SHA-256: 4a08b8e2bf60de2f13651d02b66d4da62b082bfe2b040f2b2a004a6f9a591377
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 10632 bytes
SHA-256: a91cde8969728c5f8a1870eef24456787c64fae71cec0bdbddded64a6cdc02bb

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