Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fae1922333db548…

MALICIOUS

PDF

90.1 KB Created: 2021-09-16 17:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b54978c1ab63c1db51670dfebc7618 SHA-1: e62b2b172a2f86e8baf55105633d5cba2f6f04b4 SHA-256: 6fae1922333db54841b75e8197f9901409cdf230559f04e0520b9b70b5210ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution attempt.

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://oniceh.ru/uplcv?utm_term=u+movie+app PDF link annotation
    • http://targhevaticane.it/userfiles/files/80468671024.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210913080735.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21035730348.pdfIn PDF document text
    • https://kawanmto.org/contents/files/nomadakugilivekamen.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/40722142220.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/4275740266.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d45156c7---povujirirasapomonoku.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/laxogazoseteneradojikor.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/vuvaxojebudi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139da7cd9129---bopirak.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14214794548.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cac96aba---4170951921.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613340a4c9f78---newis.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokipiwusuzamivizobodafe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1ff1428ff1dc0c45bf7af21d114416b5/wofinaxumazutuxe.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/23905171137.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/xaketebetorogudenir.pdfIn PDF document text
    • http://adice-area.com/pictures/files/nepifimulujukanavamazidil.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/22497013241.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zanixibojoxim.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/48315800819.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_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 17584 bytes
SHA-256: 14ae131ee0ac3397c9d8c83371936ddc90b4a8fbb0e51658da9cb75ae4002f3f
font_01_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001456c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456C 9972 bytes
SHA-256: 7b2bb48100dd4da784c3fc100f0995218742a292d405199504e40dd49b4d9d1d