Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3095b085ac6c9b5…

MALICIOUS

PDF

75.2 KB Created: 2021-10-22 20:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0680ac4af7174868572076822259b2f0 SHA-1: 959513b7734afb100af1a7791bb1a00c86fa343a SHA-256: d3095b085ac6c9b545b83af49102e69d1d34537bf79e4ec029d745343f4084fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites, indicating a likely attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript suggests it may be used to download and execute additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+answer+a+why+question PDF link annotation
    • http://kunbot.com/upload/files/41943522608.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161678ea20dc91---dejewokadefasi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d3eeefae169f7ed2c4b98dae0575ea88/vovavugudazef.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/37297756573.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616cfe57e6714---resisadetudetijikoru.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197b889fa3---sufuwagevutiron.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/pososepesumiz.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///pumixitas.pdfIn PDF document text
    • http://guchen.ru/d/files/55214497598.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/62401081215.pdfIn PDF document text
    • http://simoncaulkin.com/images/fafujepasobaxasuxoxig.pdfIn PDF document text
    • https://mashura.co/userfiles/files/sixekirivavutolavilize.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/juresifitono.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/zufelaximop.pdfIn PDF document text
    • http://zerosquareonline.com/file/82890338278.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/91427519402.pdfIn PDF document text
    • http://www.siposferenc.hu/html/69581908238.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/davipobixitubibox.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/mumoranaxudanixudutogofa.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160c5388d0bd---30254765744.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b54495cf849e8049c90876da969e7c85/23043186217.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/tulababoratusosekoxibux.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/dagefuvapitabaxod.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/surunore.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 16728 bytes
SHA-256: 1735e5ef75f9697e3fc345d5aee870446e52189ec6d83d3a69ede2b023b9b401
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10596 bytes
SHA-256: f3842cd8421187da107e35ebbd3b3918103e4c844395e07e16ea6e78419e9338
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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