Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2b32d9b6e5a705…

MALICIOUS

PDF

93.6 KB Created: 2021-09-08 15:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00dbecd9e4b8dacbca73fac07bbe48db SHA-1: 2cc509ae5cccb62c747aa74dc8c02d67f7b3eff5 SHA-256: 0a2b32d9b6e5a705506f915a927a7990e30756b92ef1eab5724bba5686189ebe
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

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://catamma.ru/uplcv?utm_term=energia+solar+monografia+pdf PDF link annotation
    • https://iword.de/userfiles/file/bozejuwegini.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/87562181305.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/77118539711.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/65519082623.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/ganagulosegulevilowawan.pdfIn PDF document text
    • http://toroisg.com/public/images/files/75968089634.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/5718923696.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///49769410309.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vinetanidogidixorotele.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/3257865258.pdfIn PDF document text
    • http://plncse.hu/php_data/file/74751372008.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sudexogikumubazikimem.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/boxozatewenujeno.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210908045807197197.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/jajoripatav.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vewigesuvomobabuxe.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1bc08d9c---51495021632.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907132504.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xerekobafadifawivi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e686615ba---83706971958.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13597324827.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef8038b19c---70297671876.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15127904009.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/domowegasokupanu.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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10728 bytes
SHA-256: c82db8d5e73cca6e4bb789ee426bad368b497123321c5f21cfb8659aad1c69ed
font_01_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 18836 bytes
SHA-256: 1c058e7fdc963b40267abbb83c2c0a6bb345353765cd76d6a88198b81f3ec571