Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c492d90f5bfe54…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 05:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ddba8c719353db73a6c06ee966da036 SHA-1: 8573ca06e2ca16251d2f284ec6da960af0077d27 SHA-256: 15c492d90f5bfe546f2938de06d2f86dfef5decf0c114c03b9cbff1588fb5da7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://perfekttorun.pl/pliki/velenozuludazad.pdf In PDF document text
    • http://rauvuonsach.com/images/uploads/files/vitoxolifisubapidilefuf.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/15275090c8d4c37eda61c63c735d552b/fonolozedukuvifazufu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca05338b33---zekoledekubopuxijixutarew.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b5h6dmu047abqfcddhcemdgev7/garisuximuroratozesu.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/piwunimosaputu.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/25215538386.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16085982925128---rufenepa.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/77067989348.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/femababemixiru.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af793ab79a2---kipajewiluwadi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/49095107719.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/mubabopudubarujefedit.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/i48ek5h0jd2dmp3tml709964ns/60410568172.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/4903023190.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/65440019722.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sajeleredamejupetumodop.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fdfb7fed---55659105905.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hqnimm58ckge3rhf69b780ho5e/90616159138.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/86743097721.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdc276713a5f946b17f88fbf1ae56f31/94711072046.pdfIn PDF document text
    • http://abwessex.com/uploads/files/ropubomi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93fd8dd8f---fotikodedavonulovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=abnormal+stomach+shapePDF 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_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10668 bytes
SHA-256: a53438fa953974165d022faf1a0e9eda2d46ece210a53be463ab9879436ca310
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 16500 bytes
SHA-256: 476e59b3d2582a05f837f95a35a5731848fa46eff737acd93b0f809f5d5b7155

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