Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6c74ea8d37c839…

MALICIOUS

PDF

69.1 KB Created: 2021-09-10 12:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08b622e558b437900de1cc9f07d691eb SHA-1: 4da542724dc0df4f4237a86271d67e83d34c05e6 SHA-256: de6c74ea8d37c839a5ee53d80e1c84616ab8c9fe45989504e124f45cfa220afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://duhocblueocean.vn/ckfinder/userfiles/files/zataki.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/jijuxabopanu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/nujiwadudoli.pdfIn PDF document text
    • http://castel.lu/userfiles/files/zizizipe.pdfIn PDF document text
    • https://tarsiman.ee/files/file/simubupavom.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/78347740978.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109061100265666.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58650710287.pdfIn PDF document text
    • http://garderoba.sk/images/_file/tonaxubixujokefidol.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/41561545085.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/67175716407.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352f54a4778---pagujo.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/didikobatogegupe.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/suxuvamelasavab.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/dirofakotemiwudug.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdfIn PDF document text
    • https://blokhol.com/upload/files/nefelijumewepunelukabol.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf4a84fd4---ximejepota.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/perodenupagagadoz.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/99013259706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=magic+words+pdfPDF 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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 15876 bytes
SHA-256: cb3acdbb9dff7f3b24af5cb0c5ca0ccb21f53feae11fb33d516574cd564a26fd
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 10496 bytes
SHA-256: 9b022da97234ca2e357ad32897bc6cb6807975f4d7d440084f3f1218d115ae2c
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1