Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83d6beb1516d920…

MALICIOUS

PDF

83.4 KB Created: 2021-07-21 05:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daf76ccaa560bad0e709af23409d8104 SHA-1: 7085ac48be8ebc879a4d0f8eb5e2dc6a160febbe SHA-256: c83d6beb1516d9204c597df5cfc7a22ff558f24d4e9e470bec62de8b66abae9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised websites, suggesting it's used to redirect users to malicious content. The embedded URLs, particularly those hosted on compromised CMS uploads, are strong indicators of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8266411e---kidamurelusazolowepisuw.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef215ed05---41510115477.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae063d634---46720332989.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/01b2f8eaa2951a319d86f6736d504c17/zoferar.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/nilujepisera.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a130d1480---20492456120.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/74566404877.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b046790ce20---zevugurun.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/wosakigidinu.pdfIn PDF document text
    • http://ipceurope.com/assets/file/7846057239.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0fa0dddcde0ec5b6ff56f375776940f9/zezofef.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c52003e0135---magaz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a690d47f---vakafatibelugapaga.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/743444cc467acacdb128109ae7a89ab5/22218409933.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badf271fbd4---fenixobalukiroxoguzajuf.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sefanekijoditoxizefuk.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/60934865930.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/63a62f598308f4a5567d922efa343866/wabinepigajenisukovuvi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xokixipedudoxejunotiw.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/lowamav.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/7863754356.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/piragipurilariza.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210719161921.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/266c6ecc9c8df5133e1338d86cabbf13/99535007280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pascal+user+manual+and+report+pdfPDF 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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10788 bytes
SHA-256: 258a83c619beb31e807d87817a528c61b7b74648745ceb9f46ef87931c98393f
font_02_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 17100 bytes
SHA-256: 1eaaa07ec0d9c8bfc08d6c824486ad2fd2d28824c9acd3b68180f01cea8d47fc

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