Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2adc6cd621717ae…

MALICIOUS

PDF

83.9 KB Created: 2021-07-25 06:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 086dfcd236afb6ecb841a188dc31684f SHA-1: 03dfd8f04b47b22b0976d9213d59b542ba8b87e6 SHA-256: c2adc6cd621717ae74e5467628ccae3e43b99cf7fc5d313633a2d5132e32bea5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or scam document. It contains numerous links, many pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable text, but the presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users.

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 https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i177ef4asq4j9pk4dsct6sejsi/31612437357.pdf In PDF document text
    • http://ankamet.com/userfiles/file/92977508625.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/44707197961.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/mukejaterovadatidowila.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb7399f78---76127398566.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gusetarikekenitadosaf.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/84ab2213dc05bbe22b5d1496e1cc6d1b/25116757051.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdecfad0842---witonamudigupojifiridazi.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/wabejub.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1033d4e803d37560030596d0125ad778/11635588470.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724dd201a35---bapogojaf.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1727e641355259565becee7607262225/42022280295.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/53656770881.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/53558812358.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/gugali.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/93237925847.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j8aelr4vbbum6pk3kgmlrntmb4/felatekeredunoze.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c4e91ce09a37099c4c6080dd2b715014/menixuzum.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/dbdccf18f2f9d126121a5a34ac58b3fa/39258418336.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/43b48e2276da1c6582f098c089a2ec2f/30746365773.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b333a4980---83681014462.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfba920a06---49858752743.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/38703015575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chicken+genetics+gizmo+quiz+answer+keyPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 16796 bytes
SHA-256: 433e25cb6640e0962fd647158ed34027eb69b8b7552fab6397ba75bd3fcbd2ba
font_01_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 11260 bytes
SHA-256: 636740318582d668b91ca381b005033b8b09c6698664d14ffa36d54b2f582247
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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