Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59d82c90b2d3e37…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 04:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65c288a82433e04d5e0a0221c6731fdf SHA-1: 0e55b553c810c17c00842db22065de93af7976c9 SHA-256: e59d82c90b2d3e37870fc331c92ada40afde10752357e74c3a3b28ea6316552b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and numerous links suggest it's part of a campaign to distribute payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://drafthe.ru/uplcv?utm_term=best+instagram+follower+tracker+app PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16139f12ef37fe---91728473143.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/wisex.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/40186258191.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/77667795161.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/natixewujot.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/174bf1759ef889f06042d07a61eaa1cf/xorabobugodezatiz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tipuwevarusisuwadazibanu.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/66167494838.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/95855588298.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/duwel.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fiwix.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53252780461.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/janixujimuji.pdfIn PDF document text
    • http://www.depomatrial.com/file/tezokaz.pdfIn PDF document text
    • http://fkhd.cz/data/img/67006640277.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/38661907407.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109032022446626.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/rotosuxuxonamidewitejom.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/988190135.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/27884502799.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/rifakotesukufukalaxomige.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba418269ef---fawujotukipobowagovuk.pdfIn PDF document text
    • 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 16796 bytes
SHA-256: eaf183ea48096683a10f4c3930daa69459e9e6c8ca0f53cf47d7f87c7fbd7138
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 11052 bytes
SHA-256: fff4fbc661d754e7f7f641eb3113a4dd89eb01852bdd7e7800c4b518c3cefe57
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1