Malicious PDF — malware analysis report

Static analysis result for SHA-256 95238de1197d9870…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 00:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf0c023187fce14cd33e97964e6626ce SHA-1: 6474232cb2830f1e65e05a9c17d93de5972350b7 SHA-256: 95238de1197d9870ba8d16377cd3cfa6dda63cf4850519b3c9d6744788119fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or use UTM parameters, indicating a link farm designed to redirect users. No scripts were extracted, but the presence of numerous external links suggests the primary attack vector is directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=fifa+19+mobile+game PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08a0b8e9---87787309793.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/98236754548.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa420530e2---53137890736.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/giwefex.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/15007665139.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92777596f---49017033351.pdfIn PDF document text
    • http://axwelindia.com/uploads/dudiwofosevibu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gatisogaga.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/6629177908.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210920_033629.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/malosu.pdfIn PDF document text
    • http://robbes.nl/media/files/72402101566.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/5185889536.pdfIn PDF document text
    • https://webmenuplus.com/images/file/baziro.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/19438980051.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/73304518487.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/80837009259.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614445cff1e23---diloli.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/didumisus.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zanuvujinozesexejokixu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpbc43khgmujgf2ui9polrigfr/posas.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/sizibeferukigif.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/zevomeridavuragofab.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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10424 bytes
SHA-256: f9384fba895afb92ce65b3825e17a42cc4f1263e9647e64db9e5c0eacea67855
font_02_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 17352 bytes
SHA-256: 2a5c1fba7be50107162916487b175b448b236031e25103e0b58951164ff68ff0

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