Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e898774810fc489…

MALICIOUS

PDF

83.8 KB Created: 2021-08-25 16:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db25d4b09b7198f95dc23b7dd4a3d05b SHA-1: 1fc36aaefa6819274e23a5888e3c881166250ab3 SHA-256: 3e898774810fc489911b58db219727a2c19140f23a0ffd95d71dd35fb6b8b288
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7cf35b242b48aa274d0f30c0786c7cb7/tiweregoladojewopovuzilo.pdf In PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/9de26260186af29ce3c36d04225447a4/41289844897.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/37802839165.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eaa569112---sowamuzi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453158dd9a---50810270673.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/91603835213.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b45f6ae59---dimox.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db561ee414d---kotepope.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gtudoch8l51pn0e0hf28et6661/wozenizepaxogavadakivire.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/70581752746.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/lopamubi.pdfIn PDF document text
    • http://biosite.ru/images/news/file/pefukavanefet.pdfIn PDF document text
    • http://myredm.ru/uploads/file/wudawu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e49506b4bd9fb427aa05c3f294601eb/95441395562.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6f8a7528---kidalexozenumemov.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/567a2093b5a21ffcc6d44e87aa4307e1/48054687813.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/widuxuvuratesig.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0df339e2fa32b094ae3fe504896efd2a/pisamibidewubu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xemopulaxijub.pdfIn PDF document text
    • http://df-2.de/images/daten/file/21070332267.pdfIn PDF document text
    • https://marosme.ro/hirek/file/86337002783.pdfIn PDF document text
    • http://martonelektro.hu/files/file/15752740884.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/15372829950.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/28241127560.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/52142986346.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/nadefeviwomugumofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=answers+to+subway+employment+testPDF 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16248 bytes
SHA-256: 2682c49fd66f0e0fb94fd852950243b26024385f99805957eb79e8a25e90f414
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 10740 bytes
SHA-256: c81b9c44a4b248da9d419dbe609a80e89b31dc61b246a8e6bd9f3b594dd2a6e2

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