Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53d65fefddbe8e6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 20:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ced24f7ea4d0306996ff8b9f7ba173e SHA-1: b1f97a2d0d7d85ab5724b79051d06e757e0a885c SHA-256: c53d65fefddbe8e6426e4e9fb9d3d62622844b6c74fe04fe4ffb0f7342f12301
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'SE_URGENCY_LURE' suggests the document may contain deceptive text to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://stellamaris.cz/userfiles/dideximemuzesoboxikogotex.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/6837041574.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a863f51b816a41fb4dee39760ed73440/fuvovaxatenijopimejatajer.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd3543c26---49854136763.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/palunenu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/konurujefaxufogimabusazaj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb384efbb4---58510013576.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/92510624390.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/jusokux.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vomiwejulapi.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/zosirag.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/3657467279.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba847c25d4b---pogexuvatijumoribet.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/89150246706.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/xemedanoxovipudowufo.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/wifogerotavonodil.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d0dbfb1e---zepuxi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/86382995071.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a788f5d245c57491dba91d7f485530b2/refobudaxobevo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/golebonusuwumoxusizogunes.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cae52ad2---mekugiworimu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7035e5eaba---10448121749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=emotional+appeal+advertising+pdfPDF 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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10892 bytes
SHA-256: 8cb37c1d7d27b7dd2201175540d353d5fef30078d1e825e45072849c4dfca34e
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 17704 bytes
SHA-256: a7b4be89a55c01adfca8e35fd074d3799e3d28cb54f45b1a0a0036ac58021f9c

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