Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e4d656240a5ff6…

MALICIOUS

PDF

91.1 KB Created: 2021-06-25 18:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c1867e0cc875e9b4ebdac37b5c584d4 SHA-1: e7abfc97d8b2f12d7a5eb8b55c3430027bd07556 SHA-256: 57e4d656240a5ff623af93f8059ddd47aec853a2eb432014e6a356bfe4225ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79723d3d73---62708716359.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/45749447029.pdfIn PDF document text
    • http://pi-consulting.ch/download/viruzopexuv.pdfIn PDF document text
    • https://arerp.kr/data/file///3032618701.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0ek07qt4iocin6bvfm6o1stj1k/bezudaf.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fuvulivudim.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6a78d849---daxabulewuk.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bfe3e49b8fce2b9064e9f282263c9202/63918466053.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/15494972403.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16081048eb3b99---tojapezapejijifozapox.pdfIn PDF document text
    • http://whatdwellswithin.com/file/41340204572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4450cdd5a---zugivixafamu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15727932773.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/94882038089.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f878fe12aa---47402332372.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/78884501440.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff00267e9---3510567483.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/60519994813.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/meet00t80ec7h4bnugthp7dj3s/lobexuxodobevofi.pdfIn PDF document text
    • http://axwelindia.com/uploads/lujimupamoteruzuzif.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e730d0ef---norinaninaz.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1f0ed88fefe86ae3a3075d11ef9fc5ed/leremijulevugiporagida.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=snoring+after+tonsillectomy+and+adenoidectomyPDF 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_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 18152 bytes
SHA-256: ff91baf8f725890b26fc43ea3fa42e3c846bd6e653a99f5e2ce6ba284cf0f16c
font_02_sfnt_off00014559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14559 11008 bytes
SHA-256: 795bf8a6eddf477b1d8222f1054475433a792e9b3b233cd642b058a6f8f075ca

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