Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1abd7ff6f0da823…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 13:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6b197640b800c1c59f394c8b3098d6f SHA-1: a8b90e1264795ce229d6f94c6c56e8f3509ff7a2 SHA-256: d1abd7ff6f0da82368278767ba3b46e0ad8eedf9cc69a463b0cd0f5cf1c9f6bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=zero+to+sold+arvid+kahl+pdf PDF link annotation
    • http://reklamaopole.pl/userfiles/file/mufesaduzemutowi.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/45703816298.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sigilajinugapabusozafi.pdfIn PDF document text
    • http://irths.com/upload_files/files/14266099291.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fobibede.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/36280589987.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/16850345706.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/00ec0a27e34e869a123d2141abba6af9/pelikutedilodutalozu.pdfIn PDF document text
    • https://qkon.ca/images/file/samufuporabidom.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/nokokuvudisenulutefa.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/55992739670.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631161745.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/xuzirekokowatekas.pdfIn PDF document text
    • https://curvy.tw/upload/files/suvaxex.pdfIn PDF document text
    • http://kite-surf.sk/files/tidoxuradilinad.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/7266035875.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/levupulonubes.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143691796890---57959278636.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/jatiroluxe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/73uq6geq4rfv7uocpto7cfn798/80613337415.pdfIn PDF document text
    • http://epmachine.ru/d/files/remowitapulapun.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/kajisatew.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/minudufizeledasu.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 17832 bytes
SHA-256: 160e97c504cd7cb57a4c5e530c8c92470503b31364eefb9c33170788b22e464e
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 10612 bytes
SHA-256: eec9bc7f216ddb8f3740ddac4eca1a0d1f117dafdf0ec02a9f2683a401ce95de