Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbcd2c859ddf290…

MALICIOUS

PDF

96.8 KB Created: 2021-06-28 02:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3ae9209f59013c67e446adbb9da7e36 SHA-1: 5486aa838516ba24a8f29141faad5c030c98699e SHA-256: acbcd2c859ddf290da97722500163c20d8ced369987680f056bcc1f4fca14bc6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other hosting, likely to distribute further malware or phishing content. The presence of multiple distinct hosts and the use of form-upload plugin paths suggest an attempt to obscure the true origin and purpose of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/9v7nv8p01e8q810t4qdvr92f82/ruxipojugesuvibetu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3dadbcae---vuremaf.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb6a56674---74987555160.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/39153167324.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae31a81eb0---godabizo.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/96c6aa386c728538db7cd1070673a602/momuzuwenud.pdf
    • http://safeabortionnepal.com/userfiles/file/tabigubafuwipi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f87b378db---wivexuxefasapuf.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1be4bdeabc644a8cf0d6e6fe591a7d32/36202318102.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vi3rf7dfp27et42m6utof2em90/52864677184.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d037ca46b6---wizezij.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ade4578befb---porajej.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d29d592f---18071164800.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45525e02be---77997356768.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/06u30e4mdk6pgta1mjeous5669/sofifotuwubasibepomor.pdf
    • https://nikosdimos.gr/userfiles/file/20761971735.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5s1f8gtj6l2neek9cr9875scvm/zufitikijizo.pdf
    • https://stmarys-perthamboy.com/upload/File/dudemevifeteganesadesux.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfbd867ab5---libedomofuxuze.pdf
    • http://stolizstekla.ru/userfiles/file/legasijafut.pdf
    • http://richwoods1969.com/clients/861079/File/letuxusij.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t4b7blf0c7930ms16onsoi1co0/69023488062.pdf
    • http://zaun-produzent.de/userfiles/file/19632641401.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/depm5dhtt2arv3p938s397bjol/20369232170.pdf
    • http://gistys.com/userfiles/file/madetazuse.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1p5gj7ro5l37ub6i7uuv6h08rp/valaliditafatoxodazo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=list+of+cations
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 16792 bytes
font_01_sfnt_off000131f6.bin
077d3354b7c6aaf466d90bbfc30770896b302bcd79429fdeb9b0f783e3631a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 10008 bytes
font_02_sfnt_off0001484e.bin
7706adcd502f153a8a775b7ec80e5e8cddf7ae87e78585966fdb81277b790727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1484E 16868 bytes

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