Malicious PDF — malware analysis report

Static analysis result for SHA-256 854eaa5821da8da9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 18:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce991a5f567076ade726714d2d0c32c5 SHA-1: 469480386dc82c9ac7b78947b3234eca8a68f267 SHA-256: 854eaa5821da8da956c8f3cf4993c0572c54fbd6b28e707088c8e7444f997994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kemenyseprosiklos.hu/upload/file/tavule.pdf In PDF document text
    • https://groupekineconcept.com/userfiles/file/69427126656.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/62961041933.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/511a015f8858a991be7b77fdfb5ece1b/91431061441.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a6f99a3a9c93a072206713fbbadf7c52/sepuvepijatizesatepim.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/35694805524.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/samabenu.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/didazetujenalugokikudadi.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/11012903942.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b62698354---vowovudituduto.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/46196965725.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/99648015653.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/907c8e719e4473505f61e55baa175a03/lupijilow.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/kusug.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7d1ac5cf---kujilemiwizuxuxitotosuled.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/56652220744.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f478d3a26e34a3b0aae13f7f0738de6c/zexupadutujig.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vinigumowewufapujulel.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/mokijikiriwemarewug.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/22495519192.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/54207776231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=driving+theory+test+road+signs+pdfPDF 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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 10912 bytes
SHA-256: 2c7b8ceead1572b66a3871b96931815506ba8893988fd6d0044090c542242893
font_01_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16928 bytes
SHA-256: 9674cebf710252149ee1a3d2fe4e3e0ec1fe351333ab85479b0bb31e39c8084d