Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f24369e1cba52f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 21:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 196ec68d6a21e9d35ab46a761a34ffec SHA-1: 49b09d518b49a64f575b3aa8833cfa495c168072 SHA-256: c5f24369e1cba52f5837f9f50fbf5bee32e18990a6c315616490abade84d8532
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://canadianrockies.info/files/file/botofubizoferon.pdf In PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/sagivedera.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/97c6039da0ee15d925aa651da5a31f74/29811286624.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/37565541144.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bofupatelopubiseluluwaje.pdfIn PDF document text
    • http://esistore.com/userfiles/file/27884615897.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b430ccb54e---mepuxifili.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c94df1b773c4ecd03b69bcf5ff7aba38/migivamesuferad.pdfIn PDF document text
    • https://biomisszio.hu/tmp/30274357019.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/kupavakonemanepibipuvad.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/sefubufuxakovonapamaw.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tanutebaxadupusovaxape.pdfIn PDF document text
    • http://balalajka.nu/media/56891036181.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/xezofuwitukiraxun.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p44ukuk7u6anflrdel8rj7c4gc/62458493516.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902180531.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/laduxipemanidikujowi.pdfIn PDF document text
    • http://video-cycling.de/files/file/memimubiwoxed.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/97938559242.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdfIn PDF document text
    • https://tcremich.lu/files/files/92814812326.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613343c842873---21843776521.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jegemuxumaxosawewopinewu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jemav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+sword+rom+ndsPDF 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 10192 bytes
SHA-256: 0e5c108df5050d9d2b3e8d9a80a6bc94f086e39813723e564adf9ebd38678fdf
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 19356 bytes
SHA-256: 0e9d4764f4a2de0f220cd270885c76f31db80ad56ff6ed32745200b128cde330
font_02_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1