Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed853e8ab99b03b7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cda9591d832505765a8fa6730c7f9a57 SHA-1: 7ac37d662ead06884a975616d2302fef6d2b2f4e SHA-256: ed853e8ab99b03b75cb12464a4536805d02a5e0c68d2c28842fdef1b1990ff33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cioccolatogallucci.it/userfiles/file/lafaperoxemaxidubiwa.pdf In PDF document text
    • https://olterus.info/contents//files/molenujomufenewijol.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wopizoxozogifa.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/79488019029.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3nqgnavc1u6md4geca63cio6k0/79474235783.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8e0b779---18002693209.pdfIn PDF document text
    • http://come2menorca.com/images/file/79703216688.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/10628961511.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609213ece62ae---58397357076.pdfIn PDF document text
    • http://jljemc.com/upload/files/sonuladalo.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/84817374289.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/nopatese.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/gewagisutulumodufobetuki.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609187fec8448---relojagotomakubaja.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b241502da2521d8fb8dbfa8f76ea22ab/16172534950.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/13517474753.pdfIn PDF document text
    • http://www.siposferenc.hu/html/gigivufepemiworim.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e563bfdeb3f---87956945638.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/emuvimotaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeadcce546---kojaxolonijam.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/valusovulajevonazivubo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/28030754404.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a3b504d201d0a160cecb892fcc461f28/46536133053.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/323843785.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56423b541---wulumabugebaneguboroxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=let+me+love+mp3+songPDF 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 15696 bytes
SHA-256: 169d72ec98c507aaee995c73df004e8c22339d4c9372c288c3346ca0e7a38bb5
font_01_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10436 bytes
SHA-256: d01706689e081e97c72d3e1b4369afcdb122ad39c1fa5532fcfad9ac9ec5848f

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