Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25f2a97c3678b5c…

MALICIOUS

PDF

102.6 KB Created: 2021-08-17 01:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c448ed1774d89ba3b9e73259bf684fc7 SHA-1: ab3de581d3c31289f2f5f099b691859ad09ecadb SHA-256: a25f2a97c3678b5cd3c8b2bdaf59925ea4baed3797af172e2b5c8c8f8718d5a8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chinamakina.com/userfiles/file/54859928940.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f05b33a453f---60251059658.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/fitalorenulof.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/69469e11e29cb7dce33f46052bceaf5c/6727352659.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/lanujusanemoximiwanatik.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/neromerilibetin.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/41561847141.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f59ac203---34359193407.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9f5ba04d---70858561679.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e94cbf7c6d4f1973d30b43ae646c9da/nekubukix.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/98053177905.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/bivikifudixogezum.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ccef1d44---pusebotifanofipekavu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d8c25f23---53342794879.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/26e232ef1b59b8c24fa19e3c1a669272/busakoginemuba.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6e27210a55c498a33d51f5ab77f28655/zelanutugi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/pagofadapazo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/xenenupapalufufur.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/93248400053.pdfIn PDF document text
    • http://ministerium.pt/files/numekowinaxiwesoxevaru.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ae6914b7---lesugepokum.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/letogogutapiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+celebrate+a+guys+21st+birthdayPDF 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_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 11148 bytes
SHA-256: b5323c4d9ab8d29236f142cf3a8f0ceedcac5ef73bd8f312aafecac26b210e6e
font_01_sfnt_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7D 18832 bytes
SHA-256: 482375e694b88dcad9fa946f0d68b43b7f2cdfff60fb9d080abfa64a0d49bd30

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