Malicious PDF — malware analysis report

Static analysis result for SHA-256 d788ec3b028c70da…

MALICIOUS

PDF

99.5 KB Created: 2021-07-30 13:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34dc231639d0c1e565835ee9c3e4633c SHA-1: 78d308f32bfcb55abdbd185e0a207dce794a193e SHA-256: d788ec3b028c70daefff406f955fee99665909e67e0175473209528789dfcb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites, likely to host malicious content or facilitate phishing. The PDF structure and embedded URLs suggest an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1a6480e5d---22677902460.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ff9affa5---47789379370.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/woxebilem.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/kefonomotanuponapatu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797fff317c7---refagud.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e2116f54---76015698020.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/68213fa9d5729bfd20df40f7328b2ed6/18489937428.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1fadbf513c722dd143467d477b71e92a/nazinigewigo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/88225f6047e128835dc81ed4486fa60f/87845313204.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160739282e6a5f---34919852569.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/numufivowovoxuzivare.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jeg1fqktb7e63h6bma2uot12v7/raboj.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084815fbc996---6180633455.pdfIn PDF document text
    • https://hagepoorter.be/files/files/basubujewevedoremivolugej.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/nejitatuluf.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1f691f9957836dff77f77d5c57313de6/xemoxevexet.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/dobawafenipozutumujit.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/5582960500.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/78420813304.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/9088974389.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/503671411cceb576039405a8754ee5d4/dabixaluwoniropipujazeti.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b2fa10a2---81174885889.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2fdc9d6ef0fccf530b1ef85d805478f6/18629479641.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dd5214074---8502076275.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/62215816711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+roblox+coming+back+in+2021PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/gixubatamuribufivevogozur.pdfIn PDF document text
    • 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_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 10920 bytes
SHA-256: 02b7d8728629d8fae2b1cdd571f9f8beb36af69ec5b34c630672dd752a5963c2
font_02_sfnt_off00015135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15135 18128 bytes
SHA-256: 6180b1f7231b8b4fba4370878c526c7b484c8543738472b1b5b82f6f6cabbf4e