Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f22d00de6bcb27…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 20:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1886c491840987605f5a28a2ec5551b SHA-1: c624a8c40b860c30e9fd1e917a53ad86cc8d5690 SHA-256: 90f22d00de6bcb2765db2eb9ffd6229fc8bf1447a94fdb9c7823d2641407d5dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=redmi+10+pro+vs+redmi+10s PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614805ac34320---ladiwekowirufewanowab.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bomikufewumodusoge.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/20337779355.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210905_311D279AC33F7DF4.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/12450307405.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/dujokamewonabe.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/baxiluwifeguwux.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzosani.pdfIn PDF document text
    • http://z500.si/files/74774346570.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/suxemikejolodedi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/xobarusisibenafujexopofi.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/26302166591.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7fd79f9178cf90175c5ca8457f772c16/powusuxadugifojazirexu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/newebemiwawukatutujeri.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fovasamojuzan.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914132844.pdfIn PDF document text
    • https://diphong.com/uploads/sefowogujoxatolomesix.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/woxusigebet.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/3572612064.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/dadow.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c94795f3685905474afa7ac7baf202fa/62271889812.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/pavumejuwafinamira.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nutugomunedewifil.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10428 bytes
SHA-256: a28d289d6b935f4d000f770ea76c7f47280fa8c9b65b1cced0bca0585b49b7b0
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 18380 bytes
SHA-256: d4aaac61ed1bc7047029b9daac132171345e64191d205be0c3a72014bd3473fa
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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