Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3734fda976618…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 17:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 939a407f3e626ae88f0bc7aaecb8c22c SHA-1: e4bf446e36881759a70bc97f80ceab62cca4de53 SHA-256: 83f3734fda976618732ceb292e60651fa3eb549af17ff4063519869bf301824e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952666a698---59222271192.pdf In PDF document text
    • http://gasasosong.com/upload/fckeditor/file/44764772583.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/rodak.pdfIn PDF document text
    • http://epicridesnepal.com/files/bigakokofuvimisad.pdfIn PDF document text
    • https://energooptima.hu/upload/File/lutagepegogubidafe.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/pepomidudopagikeruxej.pdfIn PDF document text
    • http://laserinnsbruck.com/static/81129858444.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/49212053118.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/21275702636.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/kakomi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/31188481713.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/9378044638.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/5737591783.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146eaed46b---gabawuxugoxapate.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90526213525.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/noline.pdfIn PDF document text
    • http://findusafranchise.com/files/files/60308809747.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140789b52db5---rodakotivoxiwutoxatuzagok.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/93287628001.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jewananamefepefelulavosi.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/978700932.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135902a0aca2---38749885422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+black+wallpaper+androidPDF 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10536 bytes
SHA-256: bf180e881c67be71fcaa099abab52c7b21a2624e635fa711df696626e2240d19
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 17052 bytes
SHA-256: 1d5075571e2c57af296573d1f05c6db2f154a9a525bbe8052596859825ce6cb0