Malicious PDF — malware analysis report

Static analysis result for SHA-256 618f5e0c1af53c60…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 19:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c52fecb1bbb95cb13164fa178a347a06 SHA-1: 26f4cac734d191db789d6db7b389f77646a7e826 SHA-256: 618f5e0c1af53c60827de288a1dcd89ab150672b7f4257ce688a02c812c8483a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://toromecanicorodeo.com/files/sowow.pdf In PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/91433907901.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607088b83f181---befetaxegerokoretenij.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/solalapoku.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58467218707.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f5990c80b50---dowokosaxinokojive.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/da848249ede7079855f1206359e774f5/9639637767.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086929b21969---jaxij.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114328f5708e---mudadulis.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/detemurazuvaretotodix.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb3e6cbb65---55496130223.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2e3d1f1a4e43374e5d3b614d16b00d6a/93785442037.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lunago.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/so030ta00pdgh3u4fdic8jb0s0/gidiziwewakepuwaz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/a0dkk2ag2priulqbse7hu7epc1/tagugasozuvadajox.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/zaninibeget.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kotepe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471a8141b0---55456097206.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/topojuwukuruxu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/18163334266.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/84206633036.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/28/72139604698.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fejezujirezasum.pdfIn PDF document text
    • http://alkanboya.com/files/file///werelitiwiraxez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/93718671040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kindergarten+writing+worksheets+sight+wordsPDF 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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 17668 bytes
SHA-256: 79eed8f6b3ce20e06c40c25e4da13c7e6e7f22a74d8bfbca4f1b1aec15b7fcab
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 10652 bytes
SHA-256: c5c3abff039b4a7bd5d13b91e5a6757ba01951d03b4a8cfdcde44a41f35a0bd9