Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d05c51276ca0f…

MALICIOUS

PDF

88.5 KB Created: 2021-07-09 07:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bec92a5ce808d5e78d705dea04185e1c SHA-1: 337eeb84bbc2ae524b33b4cc50f8aa4d698f8ac8 SHA-256: 834d05c51276ca0ff5f3cc49961585c52185c5c9cdef4fc7c8c9e09350d775e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing or malware sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8ba9303f96968f379a7d92f9533659d2/39965535638.pdf In PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/varuni.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fde6837bf---43799254719.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713af2f4e---najuri.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/midujobiwiwobuwajenisudax.pdfIn PDF document text
    • http://strandedtattoo.net/file/kerodivotiv.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83856097603.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/eb3912f190ace7fa2680e17f513f2521/40351984416.pdfIn PDF document text
    • http://fotossc.pl/_files/file/josebikusotafotofexun.pdfIn PDF document text
    • http://trivio.it/userfiles/files/nubidoxabikuxuloso.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/guvenamodupo.pdfIn PDF document text
    • https://hse.tw/upload/file/76938328105.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/12366898947.pdfIn PDF document text
    • https://inncredel.com/uploads/viriw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cbf029543---40754197921.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/23225130677.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc86cbeaa3---zeferevuz.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/bumev.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/68820559338.pdfIn PDF document text
    • http://rayanchem.com/d/files/vegotuwasimovinoxekopuros.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a4b7643d---89903032108.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/36540513095.pdfIn PDF document text
    • https://invest.pl/userfiles/file/zuzafuxajofufebijimax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=moana+movie+in+tamil+download+tamilrockers+hdPDF 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_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 17180 bytes
SHA-256: dc4a66f9df59acdfffef73abe3e31669d3ffb2a1cea18937754fc19a02639b8d
font_01_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 10872 bytes
SHA-256: 1e5e98bdb0637c312795da3f3881f19d35ffc6164332ea75e96eca2abb25c48b

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