Malicious PDF — malware analysis report

Static analysis result for SHA-256 0220693d3be61f0a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 03:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e11594e31168af7e46527241c809f24c SHA-1: 223266a43596348027fe661876fcbb7edabe3b3b SHA-256: 0220693d3be61f0a78286be8cf37f0cd3e4b2b4e62d23fc8cf778b44cb47090f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fad02532c---18231945056.pdf In PDF document text
    • https://newsru.md/upload/userfiles/files/jakijafarisa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nalojedunivevox.pdfIn PDF document text
    • https://ismart99.net/upload/files/majufigopejidodewekorol.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/kuzezuketix.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b41f3eab26---63235080825.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f54e32800022b11eb789abee640c4b0e/podisudibojezisavebonuno.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/libutofezoteganajulijaru.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210817_220424.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb96e765c15.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vawijoligekawudix.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/90924832457.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dadujir.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/16247156675.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/jaxagok.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/39769443981.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/madateta.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f09756144e2c1a6fd1dc6124922a0fd6/rujediratesopaxorotuk.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/52585434833.pdfIn PDF document text
    • http://keramann.ru/uploads/files/toxad.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/50be89fb1d59eaf4b2ee0308b66835d5/gujusogobuvedizila.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b040a161c---saterajoti.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/14295731282.pdfIn PDF document text
    • http://learningkey.org/userfiles/9126294468.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f7e0d1a1---zetolagunagokugezuvenuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=you+look+fresh+meaningPDF 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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 10736 bytes
SHA-256: fc64da881b95e5c457bc92bff42bff17d564fe0b2c323e315c56a7e38fe00f23
font_01_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 21308 bytes
SHA-256: 6615cd6a3e592ca90a745f099a39aa0666d659a16c7e3f8971ad6d811c251ea4
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1