Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc28c1c8a2a1067…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 00:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f7fb4c2467c2d5a24259b781b0dcf93 SHA-1: 94b62a4293862fa2f1e78b1a72cf1b3bb707d375 SHA-256: 6bc28c1c8a2a10672797ae3875880a398de1b29777cb2b26783da3414cab9f1d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URIs were found, including direct IP addresses and links to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple suspicious links strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=audify+music+player+premium+apk PDF link annotation
    • http://157.230.241.115/image/upload/File/57543458386.pdfPDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/wizove.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/75355844916.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5efccfde---dekematusir.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/soditizevotatepobaxe.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/81963021769.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/tojasejoliwejilo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/tisuwud.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/pumukezovimilabarazubil.pdfIn PDF document text
    • http://novichiha.ru/pic/file/59159014885.pdfIn PDF document text
    • https://webaprint.be/img/file/xopuzix.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/64404384164.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fijakasisapolesodilazuv.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/relobowipepur.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cf28e0a041f68d326f06b59c9d70018/1921698723.pdfIn PDF document text
    • http://jonellchem.com/upload/files/83647621589.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/wewameruvidu.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/90968341229.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/040953128113.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/67323387480.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/7291791867.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613568aaf3ea7---pajupusifutuxuvababaduzed.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadiv.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132912666a56---foboxipezawu.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mojufinetakudote.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/21328889481.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/49649353502.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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 18940 bytes
SHA-256: a7cc035ed58b4428bb7009563d3d49bd6c7f9a2d709ca4a1a684a3b886251c3c
font_01_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 10744 bytes
SHA-256: 86c4001a5072e26632fd65aa9d380a55ba3b91b4b79572dcd69d3f30d6edf5c0

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