Malicious PDF — malware analysis report

Static analysis result for SHA-256 126fd77ec8b24e39…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e91f08c3f993a4339d63df7bcc2d980b SHA-1: 7b54fadd4aabfa2139768d45552f44111694d543 SHA-256: 126fd77ec8b24e397dd1d69a63778c13f6f93d752a35c4d3c01ed7c74c149cfb
104 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alakharia.com/public_html/userfiles/file/kegememubafogakajo.pdf In PDF document text
    • https://delta-relay.be/userfiles/file/posofaninet.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/welajirubuzixi.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/83666587842.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6e50fc9ba9188fcbc9aea53547c68658/vipizokekevixeporo.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/8820440036.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/19e57fdf7fa8e84ce4d5a6232c237ef2/bolekekiku.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/biludegaxajugosepive.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/56339278878.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/suwarebumojivaxikazak.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/fogiwolimeguxotovakidezix.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566d1d63eb---zalegolixozifibini.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/78019107082.pdfIn PDF document text
    • http://synowka.pl/galeria/file/bapololotelajorikefa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/musiwus.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/zanuvoxe.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/tebaxefaxugejisotezig.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/wipanetesipazu.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tutop.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/vuronar.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7d1b3c54---luvekomozitidetazatat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+sims+4+all+dlc+download+torrentPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 19284 bytes
SHA-256: 75c0eb1020b025940d6693951c4e3f7acf66934fbd8b4993fc0839d94e96c92c
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 10764 bytes
SHA-256: 4b407a75bb2649f9e30c217d08a6316966ca8531a7f83b4580b3b316d0adbe66
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1