Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cee15b6fa94f86…

MALICIOUS

PDF

84.8 KB Created: 2021-08-23 15:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05cdab87303c7760f20895cc53ee42a5 SHA-1: bf83c324d0027cbdf507636888b695a50d8d6630 SHA-256: 57cee15b6fa94f86d8baf6cdb6b47ccd14329c2ac0b36b033ace1a7b6ae6b4f6
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous other PDFs hosted on compromised websites or disposable domains. These linked PDFs likely serve as lures for phishing or further malware delivery, making this document a component of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qrs3ohfsv730j42blu8b6lo4l5/65212985224.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a61b91a0490fd290da7fa86fd36cf9a/14095151923.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/voteveroriv.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/tirutobebotajikamanezedi.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/kupuwatazopaje.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4939fa84---makivasoliku.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wigipomoxasebu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/39290707452.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f436435e33b---bularisefube.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/20840168863.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98fa5df2b---13353677180.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607459f55908c---40482055958.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/69455938021.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/45ei21lnqsh2i1i37fpr6u3e63/xobukoloma.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/15858008432.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7466cb6bfbe914829357727907f418eb/97297860169.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6567d1435---fuxenuxikifuliwiw.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548374557---7851753928.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba8dc0f49---49664933064.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kebatulezive.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b96d8edb---vomijujiwofifezejorox.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1e4762030c0576c737f77d7aabb7ae83/34161441859.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/521946f957935f1d1f27da9e78978ecd/39031610977.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/54647536948.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1ffd784c36ab807b3a9706b8000744ec/gimobafama.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/dogujepifos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=office+product+key+free+2016PDF 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 17036 bytes
SHA-256: 1dd9159d2d493de99c85dd8f2bad698455d61d3a5ef3900b1295d6c71ddc19fc
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 10924 bytes
SHA-256: 6b9554292f4fcc8985164fd09f9a17186269bbb55aa7e6898251cda9ed4d03b8