Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e124a2bc46969c…

MALICIOUS

PDF

80.4 KB Created: 2021-08-18 18:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe095bb0f365c5c924701b1323cd7d32 SHA-1: ec8f5502ab6463f868d06f83f27e77f78fb69d95 SHA-256: 82e124a2bc46969c39a9307bec2c480c895a3539e3ef00c2573a4bb6860b284c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://computerdoki.hu/user/file/sosidolugituvipa.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gorepesesoreruk.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/320ce4260b679fd53ef846d212d84dbd/sevufawovotoma.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bukalanige.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vlge76n0cja0k27vbp3nie6nvj/levudatofaw.pdfIn PDF document text
    • http://chamdure.com/DATA/files/tajawisibomodivanufiz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f5b6dd8f0a321770ed4d04d900c8266b/kekugefolukonometoxovitij.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ca4093a91---zumowunoteruvab.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/im39ck9bvml3jq31fvln05320j/24700944960.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b080aac677c90c83de2717d8a583c067/19984929030.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d68104163f0---71673660428.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/8791199394.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/26816520641.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/giwemujumizej.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea3b98ef5---dageluzexefodusudebav.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/043a6fe27b531dd5f103581a9e1c9793/49470383046.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/bapovesop.pdfIn PDF document text
    • https://jotelek.hu/files/file/80056347102.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/80148318903.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b350b0dc1cf---wujadalubuxosumojefufi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c62e86e9e---57966253872.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078778f61abe---10232782471.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fumub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+add+two+functions+in+one+cellPDF 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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16828 bytes
SHA-256: ae5cfab731e997652ea3d074a472dd8c51f73cdcf7807a0e4a0b307b167e55e5
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 10548 bytes
SHA-256: 0a12cd56b97b3424f530182fdacdc80f9962d31e717f9ae65153b1fcf68561f4

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