Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd672d65bd6962c2…

MALICIOUS

PDF

83.9 KB Created: 2021-10-20 16:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 358ac9f8c2f9e22e7ff2187be92b4cd6 SHA-1: 196e7058df2f84d7303ebf02e43ef868c104cd14 SHA-256: dd672d65bd6962c27f63c77ab190b082d67b32c91ec98f79f3d37e492a81c520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to potentially compromised or disposable hosting sites, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to direct users to malicious content or phishing pages.

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://thewesternmist.com/userfiles/file/pevajenesetu.pdf In PDF document text
    • http://lotusburbank.com/uploads/files/7573233543.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/tubafaregisaj.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gefabe.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/64142674559.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/89717672878.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/mezeri.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0ad291cabc0ecf506bdb814c0acbd578/29105684594.pdfIn PDF document text
    • http://canoeing.by/pics/files/42351932647.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/52926746144.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a4a43c0bbff6753c5dfdac3956381521/27303653867.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-10-11/20211011222840679153.pdfIn PDF document text
    • https://digireg.nu/upload/mifutojonidipidabowofosi.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/jisuvodewikesedinorew.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372f6abae31---10183191406.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/99647523529.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/23160541868.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zorutafinokak.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/12464217304.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/vagopikuzadapujo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443ac1e1dd9---9099330257.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/21609821076.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nilopiw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=dbms+notes+for+b+techPDF 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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10444 bytes
SHA-256: 2f7fbd0ec31cf2daafef4f99a7ce055f3b860b1c760a2d8a319d0eec9aab5b16
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 18128 bytes
SHA-256: 94b6224690c00e254efca402a1b5a6d50696bc770755e7f211054434ceec75d4
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1