Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f6c3117835dade…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 01:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9908ae3bfcd3b1ce2f9b4f6f23e0971d SHA-1: 16af0e06cb1b214adb5b5076a6d02bc184ba34a1 SHA-256: 59f6c3117835dade788a6caf503d491a3bf7b6af1dca98f030f0ea6488746923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://smidgel.ru/uplcv?utm_term=english+business+letter+sample+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85036374f2---56132892592.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/21652912773.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a054a0daaf87c06bf7624f4608e92a85/kezijozatalojedimefuvudes.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/resuvefu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/risonedirojezifi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216ddf00f---duxamibipuwibirab.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/rusadezularuzesexutes.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/49482280761.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/58952983113.pdfIn PDF document text
    • http://honda-vo.com/upload/file/41274413460.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d76b72164---70540808726.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/befumezutebinudolajanum.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/36829064254.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95d66e8b8---60670878935.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ci80cdrp0lilevvqdpcmgdji93/lewawepesalatewuvetetad.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a47gh2807gumlqu7g5vi24g4lt/62180606567.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074f4b714---97162865140.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/10671759218.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/lifedewidexenizikirupeg.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/64864147327.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbda549f4f2---wanalugefavemapuximidega.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rekemexakigikirepuvow.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/didilikemadinura.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/30693288047.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/20b2cb18dc2ac30a88b7ecae74d498e3/22899994713.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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 11048 bytes
SHA-256: d56abdc377c5dcda0f9938e13a1177f976d105c2e9aae41c7f6b60d2f9660b83
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 17372 bytes
SHA-256: e5ca23eb1a8498d33f32e019f2903cebb7ac35986bbefb9f51b4b33b94a511e0

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