Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d214ff9e22960c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 124b0bdf1b2d0473c140189553c4f1f9 SHA-1: 622280d9bd82d7a23cb86a4ca6d4455d48fba8b9 SHA-256: 90d214ff9e22960c36aebf6a254426f9521280c77faed323f6d95f00e17343b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=keyboard+covering+text+field+android PDF link annotation
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/37878418663.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/85434622089.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/tafigoworafigorowagetom.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/rijonovakisemafi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///saxososasunoroxa.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/35494041204.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43715651703.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/wuviwanefirofoxino.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/62496761262.pdfIn PDF document text
    • https://taxinamdinh.com/data/dulieu/files/2546951761.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/noximode.pdfIn PDF document text
    • http://praguetransfer.com/files/file/85509404817.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210919105414.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149223a2450a---gogexizid.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/dijemojemosamilib.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27e9b5138---96277297525.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210908052422.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/gezaxurovipoge.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/53403796723.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/suran.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/ruvigekajufelu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7aa4f087---jagirimovet.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6sq4u8139fgmkflrpl9sjudo96/19017371837.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0387d4b5fbc14f8cba382e37a09d78ea/94316308081.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10896 bytes
SHA-256: 684c18500e65cd66842920ecf31b1092203469132a27f20bb4f991cae74afd93
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 19176 bytes
SHA-256: 3db1aea3cffedf82770240cdd8fc8d9b361b2d41173f996557ea461294b4b556
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.