Malicious PDF — malware analysis report

Static analysis result for SHA-256 7677309fc60b4d42…

MALICIOUS

PDF

90.9 KB Created: 2021-07-06 22:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b9dece0b14016fb0b0a8d56c655f80b SHA-1: 7e397e818262057431c624aeb824bd8c474a105f SHA-256: 7677309fc60b4d423fc8dd7009279e260ed3960c64a738ee0b8cdf06234a8009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=nicholas+hoult+movies+and+tv+shows PDF link annotation
    • https://pass-eco-energies.com/ckfinder/userfiles/files/kizejanutorewobimejano.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/mazasapapuf.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/27357128143.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/32dmprthpim43eamt2bt3svmu5/46782270278.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062614451470554.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f13e07e780fc3b35fa5982ff3a6de9e7/govozuze.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b70cb98a---99092594132.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4fafcec824fb368e65b3523a27e618d6/22498585400.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/34b7611513a35f02d72c3bc7ddd840bc/dawiperujizeluxutezepe.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/lekofixenetesebu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/304c90478b3e752fa4f0985bc9c2d689/didizijututanegegugumu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/18912520167.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ns5sdulkskeb0rtb6u607h3fsf/fuzozoredeni.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da19f113f2---renonezewa.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062007452320.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/nodanevezefenavibezeruwo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b2be292b1647ff7a4e1d8b7de1835adb/32658307924.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7f69a98ecebde68e6b5c8c33db957b87/pukosaromididorefu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c7222b9d---kamigalanoxitiwuwok.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2svvd7drksn31cr038g7asludk/xajip.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dm76g0nb8d0lma25hv02io6ip4/xowudokapuzufop.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93eedc41f---wopaded.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160944fa80de70---73378580104.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb31a7559---65774855246.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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17680 bytes
SHA-256: 21021a2b97c25cb2d2b4a3043bb1ccb5ec26b2fa2f9e85425ca31646a75da953
font_01_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10764 bytes
SHA-256: 350fd246ff7d40b9da5f7f44d1b1fb0c67572c95c33a2740f945b5ff661a17f9
font_02_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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