Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44a6065ae88bdfa…

MALICIOUS

PDF

87.0 KB Created: 2021-07-19 13:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da357a4d3e1c308ae397fabf09eb328 SHA-1: a40d515e0d93883436f06012f5ede8d19ff8885c SHA-256: f44a6065ae88bdfa3551d4959a0b8dff23be21df7d00ac6486aa6bd9beb4cabf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c31bb37ee3b---43074932827.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f79d288173601b9270b6b746da097567/91987841694.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8b1405565e6ac6083bbd6348d528174/mogopoviteliwulip.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c54844ee---13146050900.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/10118794789.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/309b906eae54588455ae09498721aee6/nunemedufunego.pdf
    • https://iamtimeshare.com/userfiles/file/xugonuworuzaga.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce61daea52---67602760776.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b01ec346---fupujiloxelup.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607060062477b---63555872770.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c390c626d---mogemobejodarutefinot.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4tu3gt6qlckcjm1gs230t793fl/renabego.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce4f2099b---tovapewijufi.pdf
    • http://iamsong.vn/uploads/files/maxoxepasivo.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vigaku.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/nozaxikimetegewakev.pdf
    • http://gesundimjob.at/images/content/files/20806695843.pdf
    • http://1hozain.ru/files/userfiles/files/43973572288.pdf
    • http://muzeumostrowiec.pl/obrazy/file/fusij.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a824a692c146a36028604636398a3486/loxuwusokomuxel.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160953778e8444---mataruzepidunexepililetut.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eeb12f7d---kevexuwidaliwinuk.pdf
    • http://viviapalermo.com/userfiles/files/bikorosasefolipiba.pdf
    • https://readandenjoy.ae/userfiles/files/zogasenesadexes.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662b34918f---remimaxapumiwuladifopot.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dfac7c56---webawoduzezugefezajid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=crossover+sit+ups
    • 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_off0000f3f9.bin
867840a5972260a20a372c9071bcfacad56962d0347c96bfb83682c64b81305f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10132 bytes
font_01_sfnt_off00010acf.bin
c2bb48c528f7a754f1477d01fb9df1f2decdc1c3ba17384a1ee248c870ec6f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16864 bytes
font_02_sfnt_off00013697.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 16792 bytes

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