Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad2ef4dd6c2158…

MALICIOUS

PDF

87.5 KB Created: 2021-08-07 00:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5849d2a874f6b1d5c2cb25d8373a8a8 SHA-1: 3206911e4224ec747f6644d72d28934ffd640511 SHA-256: 2cad2ef4dd6c215855feefe4762483972cc3ca573240f4d292911e0f55b0c2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://hersheyhigh1981.com/clients/37302/File/28830562614.pdf In PDF document text
    • https://autoprofi.ua/userfiles/file/81919805154.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/0daf655105481b36fe04d3b3ecd566fc/34189464714.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7b3mosb2mv94sqb1s8tv87r1e4/35067057866.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5894bfaff157e072bfff56e104bd8470/vatotofiwitix.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/77b0f6ba0ab43cfd49e0700b372c3fe8/33977226209.pdfIn PDF document text
    • http://zeci.nl/im/image/97377105418.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/solasukazakezusej.pdfIn PDF document text
    • http://funperm.ru/content/file/xedetozimejede.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/56727759529.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/52973259148.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/60434169353.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cad12dd10---2836873568.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/84c40b85f430b86674445bbc4c9ec3e5/lolizivinaxep.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/66tcevop3q7clhrj7h4u2k9os3/xurexe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773455d1d2e---kizusa.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/31867952932.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/boxenitosomiko.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/28435456393.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simokoma.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610778c45313d---xolapenuvuwaku.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/setidemuvojozejepelebi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/41352141299.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77fb013805---jorini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+check+fasting+blood+sugar+at+homePDF 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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 11332 bytes
SHA-256: b280889aaa639ac4a9e12793b8c7ff2f40221af37deae3a63e4af56bcef8558f
font_01_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16572 bytes
SHA-256: 637f9d23becdb807d0bab2471127bf66a0554525e26870e62bb6884dc5c29f81
font_02_sfnt_off0001373e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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