Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c8ee0e19d60d5b…

MALICIOUS

PDF

119.7 KB Created: 2021-08-20 02:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 58a5430868c63052c7740811bbd46f5d SHA-1: 12eb4d3535070bdd5349ab264bc5ea807453b106 SHA-256: c5c8ee0e19d60d5bdbf874540d158ef8c782fd57658d5ae5b3eb03a91c2d5a68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of these links and the overall structure align with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=test+de+domino+d48+respuestas+correctas PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9634c7445e2ab9e71ff72a5fff9da847/fikopujoxuteludeti.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5bd4f114---56618952208.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210813090849.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/67a998a7519c781cacb7d3e6758e575a/56551095631.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/45552479503.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pufalozosenerosaf.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/fadokekewo.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/turubidogoguxisiledez.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d38r0a4mdfs7ghceldl5139bqk/94993733507.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/vitixidimod.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/21129900604.pdfIn PDF document text
    • http://4bx.pl/public/file/sanosavumibokelovi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/3afb27aac99aa9e273247eaf75206771/47795911492.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/8202240776.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vejiriwugeduwi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27340bff0---kozimimalesuteguziba.pdfIn PDF document text
    • http://www.celso.org/download/lawiwopexexagogeluzogofum.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2734d1b679---paxujetitax.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d1ebbedc27d42d0e997b5aadae205793/kupipidobibumetumoja.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/tujezut.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69b4a8ce---95049415117.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/uiqbv7uuv4i7leudmprf2b6on0/jaxowol.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_off00016a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A50 10980 bytes
SHA-256: 2405611fe5230dd1d0a7879c198d5a97437b532b068ab10569f0f1472d1c7cb2
font_01_sfnt_off000183d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D7 20260 bytes
SHA-256: 2b9326e97e87fdff4d7e0d4e88d56365b3e42901d553fa435be09a84aafc8552
font_02_sfnt_off0001b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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