Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c3da42e585aabc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 17:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5452d30d615af4faeba1e7eab92e8299 SHA-1: dfa84af66fb97cfd409a407c226b561bcc590c32 SHA-256: e1c3da42e585aabc406c27b9fb53cd69a19654df0cd61888c08998a0e3cad61e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, which is a common tactic for phishing or malware distribution. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goldartline.ua/userfiles/file/76529120160.pdf In PDF document text
    • https://aynispirit.nl/userfiles/file/56849163922.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/4747967215.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/lezovupotox.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e218cbb0e---wozarovujejewopamedexube.pdfIn PDF document text
    • http://underbutter.cz/download/foto/42662098221.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92d4536a1---xurowerenidapunijofuki.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd1b38fde---pixivukugipupoluwerus.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/83705897143.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210803020855.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/81b42e6e13bf0dae976c0579c55cbe02/68390392800.pdfIn PDF document text
    • https://europartner2.pl/uploads/59300122561.pdfIn PDF document text
    • http://micruts.org/userfiles/file/vevaliwizi.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/fetawejuvetegajawajejava.pdfIn PDF document text
    • https://shidoremicrosys.com/media/suwesajenazipupen.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/xojolorivakekiwawer.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/76735721280.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/birepojatutod.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/56373369316.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/18bc88b4ab3a7f8f99622d287c4e670a/97502582449.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/76050303855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=red+rose+image+full+hdPDF 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_off0000b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 10744 bytes
SHA-256: 0725a8544c528a9a72198870b83e846123212ba09df103c7553c3b9890cdd370
font_01_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 15292 bytes
SHA-256: 7dc94faf64eea1bf020f8a471ad8d9113298dc86e4e56234f06c475fb381c2cc
font_02_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1