Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b1e20ea03ebb3a…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8918dd6035b8006501c69519186495f0 SHA-1: e2c9c905ce92e77ae677e95a159b022a9c25906c SHA-256: 64b1e20ea03ebb3ae26250a0d0db68a821e68eaaec29839513c034f3125366d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged the PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sharadsangam.org/UserFilesTwo/file/26940193606.pdf In PDF document text
    • http://smartickgroup.com/userfiles/duxus.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gebupinupote.pdfIn PDF document text
    • https://irrisyst.eu/files/file/leriwezobolumijebi.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/kovovamejudesunobato.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4078e88b2---bezulatez.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccf157aed---dixaxugawekakowumus.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/galusunisafixel.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/58682269827.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/df36311ff4c6ff035a9200c0554c96d7/falidi.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/bimazimupulinulomexi.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/dogeguwesijofese.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da3afec9f6e---83786412055.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9cb654dd770fad04287acfb125509403/dasafoxunatobu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0h114fpj8hvpildha7hfvq0kf5/55910741115.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/wunivogujidowevexanofu.pdfIn PDF document text
    • http://bscartridge.com/pic/zasikebatovojedumunef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2a64491a6---3130628291.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84797138103.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ce78bc7d---48561052216.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/vamuvopowiruwof.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/d30qn3t6h6gprteummpq7h48n2/59264399803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=isaiah+13+commentaryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00014724.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14724 19288 bytes
SHA-256: 8d2d551ecb8e0188822c5036e6ec525875f97e3aecd155e82c17ba310b213ab0
font_00_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 18320 bytes
SHA-256: a31748ac5e4509a8b01519236ea3154277eff2fb6da0d17fefe0bf96e3a9f12a
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 10736 bytes
SHA-256: 8bc020f82d0dbecdfefb031fc1d55e4ed52619190d1085e1c091b922b4944214

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