Malicious PDF — malware analysis report

Static analysis result for SHA-256 08397c7fe8c9fdbd…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 10:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afbe2e20c8606174bfc416881b295fb7 SHA-1: f3c084128dae5b201b6a84ae83bdee8491d94eee SHA-256: 08397c7fe8c9fdbdaceaec582943eb384df8425c9bea3ba971440c77ee79911a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest potential for JavaScript execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://energyexcess.com/userfiles/file/tubima.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/renezefujininip.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225e48deed---xadupa.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/rozemodopi.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/10766292099.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142f79c95da3---sixola.pdfIn PDF document text
    • http://e-sheremet.com/img/fezebunedojepunejew.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/nowulejafuwuxafokigajimi.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/fazaxilurojusodizujabo.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/famugasunafoledu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161527da77d08f---43215826748.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nsi64h891sma4o2ardunrchj57/farigam.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/53135873617.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1c51a40e---85217373989.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fuzutawexatedirusude.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/34712292838.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614197d8e28b7---39628008352.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/42005657204.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fefefisonanunizajadavexi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd4246bcb2---46233811296.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ca8f3bb6996aacbba201455fb22bd557/97306093841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=1111+vpn+appPDF 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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 9508 bytes
SHA-256: 5e213d30234abfe43a3afae8e07a3b0e3460fdf009ebe22a88049a81d6ae2ec0
font_01_sfnt_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 17516 bytes
SHA-256: 20b18963559ed661f284b01b1392530e727f39abeaa12b9954549c42cac2bd9c

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