Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da1365e47a67c0d…

MALICIOUS

PDF

78.2 KB Created: 2021-08-06 13:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 630299e6f2192cb04774374935e8aafc SHA-1: 90eaecc8b8e45749575496d6124a443e81311984 SHA-256: 6da1365e47a67c0dfc8560dc54c77f44b3f2521c73c502dd91b3d89cbd4e2e48
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b30a51107---29576847407.pdf In PDF document text
    • https://lemarko.com/userfiles/file/65429833962.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd549e1dab---jipigoj.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/126tbi5d1ekm5h8oa70o7t01pj/38437126271.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/38821220372.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/mefinopofapibom.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/rojafizadek.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be45e960451916737bd9ac7be595b190/madejidavifeluzesomuwam.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/jtsdh27socndo73b3rtjpicsou/nikoladebamoxarijixibiwa.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/toxup.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/rexawamikixabamixemel.pdfIn PDF document text
    • http://davcpundri.com/css/file/65797154900.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4676b7eaf35bfea7b5436817c4360272/28796427688.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce7fc0d54---jivubadarenisat.pdfIn PDF document text
    • http://hasyo.net/files/file/redekokosekefizemuj.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/sinikizapede.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/rudopa.pdfIn PDF document text
    • http://reflita.lt/uploads/files/simibojuvef.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/zalonokamupejusovimav.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160779fff4f7c6---78413693313.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/mikajete.pdfIn PDF document text
    • http://ahchala.com/img/file/kabatoxufobosex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=missing+angles+in+polygons+worksheet+year+6PDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 17080 bytes
SHA-256: 5217d2184a7a55bb3236f858a0ebe8c1f082ce2843657d59a7c022a77effa6c7
font_02_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 10984 bytes
SHA-256: 939b5d690c423089ce91d06eeddd1b8a98b1fbe483f9d286ef18c4b315a76850

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