Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d779d78372cf700…

MALICIOUS

PDF

225.5 KB Created: 2021-07-16 06:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b48499b81523cb3da431215f2f2c02b SHA-1: b66badcda23a463f1300de9bff072e09f0b51df5 SHA-256: 1d779d78372cf7006bf2cf7a893efaf9dbeee33026951cdaf71447a4a59f77cc
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The PDF itself appears to be a lure, likely intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 5

  • 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.
  • 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://kppzp.pl/userfiles/file/13682524637.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa457cee31e---33401382904.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772be3b56b3---7234752615.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41b9e4fb4---99630893864.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/47178950845.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/76832930636.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/rujikabunurasoru.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de591c8b8a---pemomedesesikebojetirob.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d5102ee6e20e346de76a0c24020db1f2/61726004376.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/3810989555.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b8a696ba---zevurudonewuwevemenuri.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a258666e41---ferezowomunaga.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/taxoxaxupenunidibakaz.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/s0l1to5nabk113u8uahdi0tp85/forexe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/87ahd6dvlv73e9th5m4l5dv0f4/gefavilifo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1l0hon04mjtt6jpvudtvcthjig/dasukuduremugesamuze.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1b6d018f---buvorodenore.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/54041100183.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082762f4681c---19993926137.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nudabugimag.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160948e545a375---kokinejujimuxexavewusasit.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/caa7950354e7a1fcf2dc0c5239efb0cc/tajawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=moral+panic+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC5A 6572 bytes
SHA-256: 406c0c9d6a3ca91e757a629d683a20a793b207ade2f1d09393cee91908c21612
font_01_sfnt_off000313dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313DD 20484 bytes
SHA-256: 5f4119e808c479959cd13fd353780cfd0eec321ff63d93a47be19d27a77d7228
font_02_sfnt_off00034820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34820 10444 bytes
SHA-256: eb56c3654be97a9543cd2b672c72ab783c6e1ba5988e5ee25568659568411890
font_03_sfnt_off00035fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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