Malicious PDF — malware analysis report

Static analysis result for SHA-256 33440598d1d4eba0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 16:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4bc5e6b468299eb8e5d2a89831e034d SHA-1: 69ffd462732c6cc2555ac371112bfa5cce552c97 SHA-256: 33440598d1d4eba07f4cc835157431c672e8e5800192f23bd8e0a785a656067d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple links to external PDF files, some hosted on compromised WordPress sites, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, suggesting the file is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goez1.com/10005001208290177/ckfinder/userfiles/files/74169251408.pdf In PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jumot.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d37914c78cac9422ef2abb7e7f19bbb5/3785917585.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/79627628532.pdfIn PDF document text
    • http://sushibelovo.ru/files/lebumituvo.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/52684406952.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/zoguru.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/sadegumav.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/fuxerelenovogi.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/82984608278.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe13d090d---79201097379.pdfIn PDF document text
    • http://maidichike.com/upload/files/bufinavenevugurawu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/dizemareva.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/motijanezukozuna.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/xumujawujijenum.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/sedejozonipapixirasifo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002aa832e7---94060802379.pdfIn PDF document text
    • http://eksternest.be/images/file/gekirafekijofel.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gunanidekow.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7bcf821ff---89715295686.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/wemanetuloluraloka.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/masizadivegasala.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/xurimo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/fosebidaxalubetabufemobu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lokafisewunorufak.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/90362029092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wonder+woman+1984+watch+online+free+nowPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 11156 bytes
SHA-256: 624e20bcd3080870935039f29a2deb1bdc18ee48b7795ba73ef86e85d3936359
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 18312 bytes
SHA-256: 0ef49f19bdb1aec1d776ab888010eca36837c2fc2754aa5e132d207ef4cd12db
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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