Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a5c083ecd0160…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 01:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 66b7ef8161df7c3d0c4279d324987137 SHA-1: 2a4731c5f7b4ebd6209c36d49a2406eb79b7629d SHA-256: b58a5c083ecd0160b253a2725284e93fa900ca08d68f6efd4a48c46f674c8147
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The document body was unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0247a7834---zazilajipitanezalileva.pdf In PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210627144233.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070257ce6dec---detazejapud.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/sajogiraseruxejuwejo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/40c5467634010002e05fd8ca104a3297/fulozezuz.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/99cdafdff344a9fc4c61cb85e1ba1bd9/xigujakere.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1da97010---xobofuj.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/58787647473.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8598e75d8---xiruravokapop.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zavere.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rexubufijuzev.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d2000c1e---53318091448.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b3ee444e38d5607f24f86b2e13ff3698/32381528936.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fodekobibapotenozolobu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f9d25ec7a097888c9f80a3fa4bdb83e8/wopesagazuweroxakuje.pdfIn PDF document text
    • http://findacommodity.com/upload/file/76000818450.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c97832899---kawuror.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8e465fe282f6e3dfe3ad9b1a4a3007ca/38983314408.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/fevezoragowedozus.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a209f7456aadde8bc09d2f48080be383/78635637576.pdfIn PDF document text
    • https://aedwea.com/upload/foto/10650297320.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=self+actualization+refers+toPDF 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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 15736 bytes
SHA-256: 6de0dbcd74390fe4149b9f118407ce9af89cf876a8290bf6f86c6df21d2fe1b0
font_02_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10564 bytes
SHA-256: a65039164a7654374f7649c162fef4be83e38606f3886cce46fb8fb3d4be05da

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