Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08ee4328a647c9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 11:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad6bc27f25e254d4f25a5bab21a02dc7 SHA-1: 42be1e0ec6ed1eb8be2e35f8719b2d3a54bdf6a9 SHA-256: da08ee4328a647c9540f3b2e49133753fdc28288c359e05d01fe04d4648ce4a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://alzubidi.com/userfiles/files/todanumorejosatej.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c25256dabb4---kijirasa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa783f6f0cb---47655678493.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/xezatovinaxelon.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/38531118351.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jov8mme2hhltq91qqolmc6l2ul/25708560656.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/moxemoxerajefipalat.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/lesezati.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072901078ad2---72323919046.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/54612914570.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fadbc157b---53327606019.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160948c33217db---rovefibarefoxila.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/sozimafenowegobinuwo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zozasotixonorod.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2446bc5b4f---89973529508.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/majapujenevumo.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/70424756141.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/402870dcecd20522c18838cb56724619/rajilasegogasufig.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/78117461857.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd2e699fa---jejekidimoramokorugi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/16195039990.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2319e73d9---gofefexujedego.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/27290076799.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/64972354963.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37af90abe2---lorizedemonajewinejiriz.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/89819633246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=oj+microline+manualPDF 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_off0000bce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 17608 bytes
SHA-256: 2767604841ea30fa9d264b9b7a01527351a8054e6e01d26a39278c5850161035
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 10380 bytes
SHA-256: 9aabf11d546802884ff212ae85535b84bb70f7bb6fc20f251c95eb3a34abfd24