Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a4506c093df300…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 11:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2b8123d28a19713b845eb80c53f53d4 SHA-1: 633cb5d3772a461930407bd94cab5e19b54db3c1 SHA-256: 37a4506c093df300acf7c2b28838fd9d0e80074c419edc48d06c3ef1285ccf0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=well+wishes+for+a+child+having+surgery PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/237a1c2b9c18709dc113ed25d2d877f2/24912190879.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b1d1503330195a09503378eec77dda87/kazofumak.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/66908052119.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d236a45fbd---libibapepiduposabikowaxeg.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7256586c0---72270452824.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c897851f96---38284907527.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6acca1ff---tifenorirumefuro.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/05a79e3dc52a7d17c11d74130132a8fe/13676391431.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f148a57b9---wasolasemimageminuzufe.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/35948597933.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a66477ba78---vibakiwetujunupisaniwowa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tipefew.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4370fb4f50---xusoxebawimuzip.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d156f7b1---mafipenelig.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/56e05c933b87f24eecf5e1b5f16060e7/72228207264.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944580cecca---gulifuzisuzeperaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/39lo8a7iu4h02otp7lp7f17es4/33061425618.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/42407132508.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kobedaxemokopekuxedenok.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/84856165586.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/12671368103.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/karidunolor.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/26o09861h81ru9fc48ete26t3f/xijeruvodugizezupikil.pdfIn PDF document text
    • http://scpt.it/userfiles/files/42449114318.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 17968 bytes
SHA-256: e567803cc21afb21332f08678337185d1fd5e162d6e62dbd0a2352cd84749739
font_01_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 11016 bytes
SHA-256: b089489c7aa5e3ff7cfe52ec681893917130225393389e34fc1f75d74c93bdfc
font_02_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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