Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b54c41e4841784…

MALICIOUS

PDF

106.0 KB Created: 2021-08-12 02:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3985124daa6c5df4565f0884f0d6f598 SHA-1: 1d5f050ce8c77cd5b2975facea695ef07abf5797 SHA-256: c5b54c41e484178426f90a13e45588d033f2fd625efe2a8ce705a7b8ea82b71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hbfilm.ca/resimler/files/zejewomobafujozer.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/mupujez.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/4572074050.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/gijogijareriboxexoxew.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zudusofadujanusebob.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015ae5955---74530708486.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/bemokadaxonixudagevuxe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e53b7c2d2---xijewolemob.pdfIn PDF document text
    • http://devison-matras.com/upload/file/tawesigomajap.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/de4052ed8d2e39f26badaf18a2ac7945/fiked.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5b2c65f---64475246100.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956af4ca224---79964960263.pdfIn PDF document text
    • http://sbkf.org/files/files/gutafutiwegavijubiz.pdfIn PDF document text
    • http://ligneus.hu/upload/file/sexefemelimeribimurav.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wawejo.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/57071070142.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c77436d4---61099109566.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16081380cc70ef---nobepoxedasixafupanagom.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b2042020---lazuxomekujidobekup.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/mebusulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a944c6e14---mokenujamitukawupogikivo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e409a81385---nuzidevifinidari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tintin+in+congo+colour+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_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 10396 bytes
SHA-256: 93adf2f60766baa374898f35a1c8991ad287a1b889e0d423f2cd991118c410b5
font_02_sfnt_off00016871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16871 18912 bytes
SHA-256: ada3387176ecc8643aa878599de8f96abe27b151531261cededb2d5b7f63f264

Open this report in the interactive analyzer, or submit your own file for analysis.