Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f79cc327a66f17…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 23:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e56a28fb155e5772fa3b80a1518c493 SHA-1: f18c525b78fdcb78fadd67052462c879f98181fb SHA-256: 90f79cc327a66f17fbd7005ff892f0f93bc42d658ceb331ad03f9ed9167aae76
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=after+we+collided+download+mp4 PDF link annotation
    • http://zdrowejaja.com/Upload/file/22815356530.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/vuvebitovafebaw.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xamox.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/punizurojuj.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/xibiloleli.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/39e0ecc5c7b9d3f907f2d968d6ec735e/59271446752.pdfIn PDF document text
    • http://elsped.hu/files/file/95988458786.pdfIn PDF document text
    • http://kccmaul.com/files/files/81626703258.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/vibipatamikaropakuwodu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da9ad50fc---2653776184.pdfIn PDF document text
    • http://schokozentrale.de/idata/54748227076.pdfIn PDF document text
    • https://yasacompany.com/upload/files/muzebotunijoguvutibububo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/wosusobizudak.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/51528124910.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/55064545596.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gisebifaz.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161371bcedee3c---7135921340.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/36561817677.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9eb5b789---68075606363.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vpcs2onv8sbap3ocsho12klb33/8160561822.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_071214.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/58397120292.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a08f56af0---nofewokexerovikatujelok.pdfIn PDF document text
    • http://kesifveotesi.com/files/fawimojibane.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/69486491313.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/2734752966.pdfIn PDF document text
    • 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10760 bytes
SHA-256: fee09550b1f1bb40fe092a3e61d2cebeb4c04661c2fa84c049edfa248f8cce43
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 18496 bytes
SHA-256: 1ccc7caec870be56be3dc8d22516122a5429e549ecf398be3644d70be0a9608a
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1