Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f8785119be7c1b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 21:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 33cf87398a9400fbbd737570fde20780 SHA-1: 2a3641dad3e53083cc98a206389d8cd3be27dc93 SHA-256: c1f8785119be7c1b2d2652d1f880634f1d3c4b9bf5cf2f19412b528518fd5f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm for SEO manipulation or to distribute further payloads. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bloomx.com/sites/all/sites/bloomx.com/files/97754493040.pdf In PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf924c3352fe84881ae53cab2655360b/muzikegexuwabulusisuroda.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lodawod.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5520fd206b---53662912050.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/ximad.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/45db17e4895991a54ba3239c15f5f7b2/63100092888.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f2ab99e814befce32a4833e58f1c64b/12278714598.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/ravojorewapajexuzegufu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8767088b18---ribababisonu.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/41233514395.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/96033197119.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625889503.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p6ko8j9g24a5939nfo0a3s4ic7/55415591295.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7d92ef72---4992258808.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/23442179096.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1a8d5a73375df73fb63c4c3d7a9b66b3/30951000772.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fn4kp16sij5d2957eej8nbclkm/11736757884.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/puzepipixadozetol.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbbb401de---13636466794.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/9773720842.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/8389827193.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dl6qr5i1hbtpvhq601im5cpap3/mopevotexedijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=conditional+statements+in+unixPDF 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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 17732 bytes
SHA-256: d42b6d54ac99fc877fecc3506b1e214949790f23435e99f8bcd3e0939013b754
font_01_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 10540 bytes
SHA-256: af204c6125e8ee622b26c159bd48c5156af844de49f5836b7b2a822c14f7a96a
font_02_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1