Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b02380a7650d835…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41fc1309da83c0c8e0269611c38b017f SHA-1: 0aca3407455d5698c626357fd8ce11da40401037 SHA-256: 9b02380a7650d835962494e59344195d4d732bb8439d697a9c2e292e387a8083
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d88ba20d---10320938966.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/98dae8ab762e378ad7edfe964845620f/99096691129.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ed9ab7d9---86105870414.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/93370677898.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/gutifumapemov.pdfIn PDF document text
    • https://digireg.dk/upload/69132008400.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/maxazixuzojixibijilava.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/kajemilejebo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8060b6d17---wagoreweviwukovez.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa687c3fad---nizitinet.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/zitufe.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/65973e1dcdfbd4960b65bbad55f64957/40379194912.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/16258561375.pdfIn PDF document text
    • http://wsm.hk/images/files/71714077150.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/wefokitanunapojovibotuzi.pdfIn PDF document text
    • http://mweb.cz/images/file/kinogotedunosajalame.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/85027645506.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/zuvibifunilulezekat.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/memilizutin.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sakafelizadivawoniwoj.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/somowumi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9131e377---mazelajuvobis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=innovator%27s+dilemma+hbr+pdfPDF 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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 10956 bytes
SHA-256: 0ebb85a806ca7e41fd6e2e3ab3e76784a0f302411ec615288fc72e854dbf4efc
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 18712 bytes
SHA-256: 99c8bb45730b06581f20c0317e857704c17e51ed2b9b2eb7689e0f28ba528ff3
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1