Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff949b53b7a2cf18…

MALICIOUS

PDF

65.0 KB Created: 2021-09-17 17:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed8060cc85887cb71ecbb776e25db63c SHA-1: 0ccf7c7d157dc55a2b22f5e0d646e8c1c2263c92 SHA-256: ff949b53b7a2cf18b758b679b1533d614194ce2c664219eae63351430c6b493f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9131

Heuristics 5

  • 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
  • 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=half+cricket+pitch+size PDF link annotation
    • http://word.mn/uploads/assets/lurot.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/losomasutewu.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/duwinutoze.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jezagawepozifejo.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/71445311901.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonutozo.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/nufuwo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nafen.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/50da7e8ccd4842609ff88a6fa3a6a1f2/10814120440.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqcl8gq9p9rftolic3bn7gk6s5/lumezeloz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4f90f193b8113f32df64985ce9b7531/gipebam.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/65410886133.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210917_092245.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4c595379785f3d892cc71111efe09bae/42984197850.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lazawefuxikuwome.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/kebowinatuzufubetari.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98284595407.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/rodefavirikilanogaxafoka.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/wozegobijukuwemovuri.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/86448160764.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jevabum.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gdulb0ada1vg6oeql73abmnv7s/fixugumepexupiwuju.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u03ptfp07ajukvcjk2729ogd73/zinidaliwaritedaxiduduwu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/52085348308.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 18000 bytes
SHA-256: 0f5f4671fb8caea7c06195934548dbcee65bddb0425fe851bab24a313be6bd6f

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