Malicious PDF — malware analysis report

Static analysis result for SHA-256 492b07221ccbdd48…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 23:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5818b8dae8180ad7725845183afdf954 SHA-1: 38cfe27f0a81c3b06e47c1d2dc960c33f929001b SHA-256: 492b07221ccbdd489cc8ead6a63c8d74346921e301af094daa68dbe3d4aa4961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or further malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

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 https://infrive.ru/uplcv?utm_term=sqlite+editor+master+pro PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0bicojta72o1fcs7g9idhq8p4v/mevulivamasatoxu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/52770675318.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/29740255671.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/88766311484.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dafaludox.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8f3209e35430e01a1bed11d6e1aead4e/83856133116.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c87b1c3ae37d7b99defeb7b1426b4c3b/21211978062.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/49476720077.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161367f6716e3c---xomopuwevazutukoduwinejob.pdfIn PDF document text
    • http://naviway.su/upload/files/liloxelebidibesub.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b17acd8c529b1ea41b0116f44dc2e241/17522136692.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rejifotozowozuvokikuvako.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/86260561871.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139298aee619---zadodebizubakaw.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/zibego.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xilonevoritodeti.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rijelivi.pdfIn PDF document text
    • https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/32783154833.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 2172 bytes
SHA-256: 2acbc3b53d21cd6c7e435960238ed0d13be6f658fc61e32911ce60802a14398e
font_02_sfnt_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 16056 bytes
SHA-256: c8dbd1c9eb856172e303b9b8092b8ccb84f1198ee2e038862b3c32d745e1301a
font_03_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_04_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 10668 bytes
SHA-256: 97926a03ea87361779120a957a6908bfb40dcbaf93338bea0dfa8ee3f6dfbae6

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