Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c4770d0ea0d971…

MALICIOUS

PDF

85.5 KB Created: 2021-08-21 03:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b410091a09e6cfcaf71161391f7ef574 SHA-1: b0ba745718bfb9d0c728586c1649400ce9ededb3 SHA-256: f5c4770d0ea0d971a294893980b9eca5ce870141876377f934ed2b676719a1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism. It contains a significant number of links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infypos.com/infyposcms/media/gogopatebojogelexol.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5rggc7ibd778m20bsv67t0ugod/vejijufuweri.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/59652413079.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aad2cb0b0---24965311022.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/jojowejok.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/59429891619.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/nekaxopisibosedij.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93cbf5814d---39729897520.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/degogilawokusuwonepapej.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/32e7d49a462dade4c9f49391d26dd7c9/fikasanevajuzi.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/debuz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fdng3snivl5mdltt0njhtg9v45/53517925934.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8becd35e8b---giwejotexakoverali.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/60484889039.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/35174650665.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kmj3ehc20g6qudf90e31b7ojt1/fukovivol.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/dojafefu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0eacab76---95896050483.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/58736947420.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b1d05bf9201312b279bf62f61de500f/ximusowaxukavutir.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/zobikokosuroziziva.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210820105209.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/kegidipewopanuxitaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cvc+reading+comprehension+worksheets+for+kindergartenPDF 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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 11296 bytes
SHA-256: 47c5ff3b5dbb51d0250be2da1b35644d6fa3b6777332f84dbcadcc7ef9a82a88
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16812 bytes
SHA-256: 45f3b40a40257c9aa13bdca86b6e4cc3e7177fd03847ae81ba573d792c46f685
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1