Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf45899a7fcdb2a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 06:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 129965924f5cd48d79482641019956f1 SHA-1: 2d86758bf2564dfafda22e6344a3995d403d6d6c SHA-256: dbf45899a7fcdb2a92879903caec5a3e299eea1e0f89010419251a4ed6ab4df4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. The file's structure as a link farm on disposable hosting further supports this. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crewmak.ru/uplcv?utm_term=the+ocean+at+the+end+of+the+lane+summary PDF link annotation
    • https://study4student.com/cache/fck_files/file/24874710356.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kanarebewofotaxof.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/40366635022.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/43095257094.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/29913647072.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/jalalejavuxif.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/gibatuledubeledofigazasu.pdfIn PDF document text
    • https://mashura.co/userfiles/files/ranesuriwofixipukozaruwa.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jleq7t2d2a0flb52v3f8aiktr2/wezomapu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451cb9d1f3---tijisuvapopasopugot.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8da41815790a3f174a49b3fbbdd88e5a/kisekaxusopo.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/36479339470.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd1053f734d12b5057b20bec64a07949/94460063680.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/71675339766.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/fc60f5e008e235a55d324c3300c40577/8286406700.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb47c70c---89798081301.pdfIn PDF document text
    • http://twinslock.com/ckfinder/userfiles/files/nelazoxezi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/41466519321.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/78036177214.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b41cbf99093---75997218916.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/24188586098.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/aa8401804d2f1b2a8b906904defdafa0/6808466989.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/4318351862.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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 10828 bytes
SHA-256: c2699840df3883464745c88a5d280fcd1b2e9737ad445f7c03fba0cdff306092
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16516 bytes
SHA-256: f6a78878d6dbdba960ab6cc0e6eb305240718df1997234764b34a879f5ee83df

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