Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b130fa85eaded0…

MALICIOUS

PDF

106.9 KB Created: 2021-06-29 04:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e933bc38e8ccc9e9b7ceaf2b76268a4 SHA-1: 8a946a7c7dd83b7643010f73b18518111790a35a SHA-256: 16b130fa85eaded0fc2b2feb3f6e608ffa80c2fa10b1be801f2366610875ae90
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://vmkmsz.hu/userfiles/file/kowovav.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b056537cc3e---29155507149.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6f4afafc9a9bc8485bac4a3c2e07b6d3/47894285079.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mokapikibid.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/wuvevupitorujelesola.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/48641037163.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b974d08cf4---77081948655.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608098dfca520---77315162453.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/85186447695.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecb86dc9a---7811756218.pdfIn PDF document text
    • http://short-story.ru/upload/file/89982999517.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077bede2f7d2---kuramabobivajugerajo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/29aec7e605d95d0d79741d3d34fdeaa5/sederiwafobifubiludasizej.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160744451b3073---tawomekimupirinawo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6320a140ef---didafefeg.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/nugawumimawetixadufiko.pdfIn PDF document text
    • http://webursitet.org/Files/file/tifutemodefewewidop.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/xapagidirugifipuvelu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01a1455de---63796350503.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/90673168790.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zivizodojogixujedosubev.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee803a374---fonokab.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/jakisutinolanepejod.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mqunajvnvfin8resjfj9bieoqk/zubogol.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160824d787d09a---bujubed.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb9l53q026qoo1v6um656rpa/66565453810.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab82cbcec22---mawalabigemibobuwebidozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=anesthesia+without+intubationPDF 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_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 10368 bytes
SHA-256: 84425f06657a616de176e2e850082c0b98182da813fd55ed55a13199b19172d8
font_01_sfnt_off00015b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001733e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733E 16552 bytes
SHA-256: 7065bfa4a6cd1d7f0217a7459b3f2ea84cd919427178126d7621fca5f9633501

Open this report in the interactive analyzer, or submit your own file for analysis.