Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7ff6f5dd6ee9b3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 05:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1da42f41e8d965ac9e07319623d54ca8 SHA-1: 76c6128cfb3d23638733b176dd4682efaaad8e39 SHA-256: cd7ff6f5dd6ee9b3a9a8aa9b838024be973171db6e6d1fee895eb16dc7e9d03e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely exploiting a vulnerability or serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=best+traditional+r%26b+performance PDF link annotation
    • http://kazuma.ru/ckfinder/userfiles/files/luzizudefowi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ade3bfc66bd2833599b9eb8604d21ce8/92479430889.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e9446f8b85f---banelamo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/325a1heqm5c0n2l1cqst5isn52/vexefedavexazulegivefol.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4c0e62412---91293013314.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/97996550214.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006dea06737---90860362415.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35cdee65---siropom.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078579d5d439---wilalopigosused.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/5436949757.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/buxamoduwojopetaxug.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/36664800822.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/guvanuwad.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/60019042396.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/98868488359.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/17494520708.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/60182325999.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/ritojepoxijavigago.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fuwitefitav.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/eb356786540f4218e38224853fe41d85/zevarosowijumowex.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161170a929ddb8---fopevuku.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0dd84a6777c2f1a0e95796940b3bc9bf/girureza.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/lodawusivuvikulinagu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc38d60c8---gabupupegekux.pdfIn PDF document text
    • http://tochuchoinghi.org/files/lepurisomesutifap.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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 17464 bytes
SHA-256: bdd03a3c57a22dd073e4ecd175e3fed6cf718581c7ba63fb8c0b31609834344c
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10292 bytes
SHA-256: 61ec1f30700f8b4804259413b65b44d1310ea83d222929fbb4b0339376229a8f
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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