Malicious PDF — malware analysis report

Static analysis result for SHA-256 f945d7b9244ee954…

MALICIOUS

PDF

82.4 KB Created: 2021-08-30 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 076e22ef870ec6280a7a707ad4e25760 SHA-1: 3897ce58dd7a29f8c15547172e941083157a6abc SHA-256: f945d7b9244ee95424a3bc39acd8d754bc0c578d6b1f36f9fec57f5f0eef2733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised websites, likely serving as lures for phishing attacks. The presence of PDF-specific heuristics related to URI and link farms further supports the phishing attack pattern. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=is+hno3+a+strong+or+weak+acid PDF link annotation
    • http://facilitymanagementassociates.com/survey/userfiles/files/dukifeduveni.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f235d562fc0---najizibagika.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nuwixegokufikozusanewuni.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8b6ef9eb4271e99df402558ad45beb3e/37691219505.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879835bfdfc---15221771735.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/88872170535.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92d3e66ac1---71682664095.pdfIn PDF document text
    • https://italvaping.com/file/zibisidewizamejotonaro.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93840176fe---wabowasadopexevizakaz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5760a5b1ab---41943153382.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc97b986---86227346563.pdfIn PDF document text
    • https://atl-50.com/files/file/22426876025.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/jatikorevewejare.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4plnbsupjva0b2rtofotom496k/38541066762.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0df8aa65732a08ac155297d3e7341b5c/fulafukojewixagoko.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/84a58fb662a5a3246348ec8e99f71a9e/14038989291.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/d62u75qvlgfaoilkhvn2rt8kb3/26947661717.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1cf484ab78624741c86671cf34cc1d37/69894142941.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ea9e97aea3c7643ae7f1e4120c1c290f/25823240080.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/79223876935.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/vupokavidalureresifufol.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210703_1A12D05D1563C809.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/erk7lqdkjgc5vv01fplioualsp/74429857017.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kilijimorutezod.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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 10904 bytes
SHA-256: c67ec51f31911c13efacd9546bb8cb287f52f3dc5d9b6cfb82a917e12a5b1aea
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16868 bytes
SHA-256: 6ecbe40d1a4e03824e17ba6d551b6ec6e28e26c8c3cf59ffe2ea165e7b2cd439
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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