Malicious PDF — malware analysis report

Static analysis result for SHA-256 7664f17cdfebd701…

MALICIOUS

PDF

91.2 KB Created: 2021-07-08 00:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40e1a4fc5c4c0fcddee9be383ec8d35f SHA-1: de285b7d831aedd2d906ecae0caad2e36c50de27 SHA-256: 7664f17cdfebd701f5c3185ce3b92a52638c59d7f39abae737e597aebf437d6d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable link farms. The primary function seems to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://moyamoya.center/images/hand_uploaded/files/62248683725.pdf In PDF document text
    • https://harrisitalia.it/uploads/file/7034249047.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/12284251ae99799edd9bb6e3f0297514/tafamax.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/28045208070.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/68844121592.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kmniphkg3ifp4mdgbf4f1fbker/zujunesodizajim.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/31513190498.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xezorokubi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072284ba2407---40216707883.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160858503437d9---3530181081.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61f376f61---32383722904.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/46802303955.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021522259386165.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f465d30daf---64013370740.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ec111f5b---vademegibezixefana.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ce45743d---jobowisovuniwidigofub.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fb3fc780e0300c4b34248bcd2dbc1a72/gibokikonuzogunivagetuz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r3tbrji4q6vrfog51l15cqn422/butiwatamapalij.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/noxezodemen.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff3d0b0c---24778489690.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/14506931514.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/78b582526653e82b484e86f0939f87a3/49577682846.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/63715898363.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608032768d640---9529833017.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52fd0e1feb7a550911bff364dbc11e6e/kipapurubujujuvolavesox.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/89576327215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+silencer+storePDF 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_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16840 bytes
SHA-256: 4bbb032dedd1e66aa7190bc1c379d75fe663c57a0995492a2135cbd37d51c6a7
font_01_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10128 bytes
SHA-256: 5810ec00405a0e62581ae7b3401526c7b2c396e30e961e26ac6f5a761fb5d9c2
font_02_sfnt_off00014760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1