Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ec356a61a99a2f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 10:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05c6bad028914bfb9919b909c3a92f9f SHA-1: 8702187671106bf778cb450402046b0cdd0104d4 SHA-256: 07ec356a61a99a2fff317dd30de86bdf6e7e51ed1884a10142d78b967257860d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The document body is heavily obfuscated and contains binary data, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rkdestate.com/userfiles/file/dadofomesemamas.pdf
    • https://mmszke.hu/files/file/fesimasix.pdf
    • http://buddhavehicle.com/userfiles/file/8464131431.pdf
    • https://heritagecambodiatravel.com/userfiles/file/36091738155.pdf
    • https://samngaimarble.com/html_upload/file/vaxozeranamowezusamof.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/worafidumofimij.pdf
    • http://zaiger.ru/img/file/64948559029.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/315c27040cd307c61a5efe8150ca0a00/jipena.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/203610476f01036bc747177e227924e4/21715468250.pdf
    • https://clifestyle.net/uploades/userfiles/file/vobiwanotixawepiguzobox.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6cf3ca93aa0978540174fbb5a18e35eb/56862811087.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wufulakezagexafuvojexo.pdf
    • http://controlsystemco.com/cache/fck_files/file/fizoxilab.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083326f43124---mizezatijadatukose.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b6127a993---pegenaredozexopilinud.pdf
    • http://abwplazaview.com/uploads/files/lasalekawowupigoxedabi.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/50351282652.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160945d64da0c8---rifafevewofej.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jmkaor3o84k5ggqbbgah3ag66q/82169372520.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0pj4tpip9urdl261gn7g8d9vg6/69393320122.pdf
    • https://nguyenthelong.net/userfiles/files/gimavajanomutorixejizud.pdf
    • http://chinalabware.es/d/files/xevizopafu.pdf
    • http://kudusde.org/resimler/files/roxupulometifugakivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ben+gurion+biography+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a9.bin
cf3e48975586a6f94d0baed7514c1c981e425a59668691f58cbeac00fe4bf437
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 10872 bytes
font_01_sfnt_off0000ce4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
font_02_sfnt_off0000e65e.bin
6fe9b2f35d92b5b945fbfd721766e41bd021282388edecce43bf4800c14b2107
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 16168 bytes