Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3fe024a90dcc43…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e86420b3c6daf4c4deb5e6b5e3b5d99 SHA-1: a34ce3cddd33aecb9b50b28efc576319e32983da SHA-256: ad3fe024a90dcc43f1a2eef109a4d390cd94307ea4300db6b05bccfae9f8b094
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous links pointing to PDFs hosted on compromised CMS platforms and disposable hosting, suggesting a link farm used to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.hippocratio.gr/ckfinder/userfiles/files/mefajanirexoxuda.pdf In PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jipemafuniwita.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/42f9bcb56c8744139b276a7e4b74aae1/bemekirevuzode.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/95526458072.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xakotuzivagaxebar.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/lenoxasimiwopunagaj.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/wupuxobabe.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210909081442.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zogotuwasizimabadi.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210912044817.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/26613054466.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95b63cb59---masutavasilaxapurokun.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/sidilorujimamokomagusu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/68828114537.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/faxovanunaxapetepi.pdfIn PDF document text
    • http://sivam.pl/files/file/3571583745.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/wajatubiteranuked.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/senutijijuf.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/lenuzoxog.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161401a4d0d658---pekozazedez.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630482277xagajiginizumefapin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=twilight+new+moon+graphic+novel+volume+1+read+online+freePDF 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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 13960 bytes
SHA-256: 1e2841ef3e7cfda8519ea0b3417b03916ca89cf4fbdc9544e57956d4a68bcca7
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 11168 bytes
SHA-256: c12d469f43b4725a255a8ad40d6b5d92120dab83649c0714f98a4cf8760a30a6
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1