Malicious PDF — malware analysis report

Static analysis result for SHA-256 c988c30d43d67472…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 17:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3b7a32b0058a277b808b135e82a5b75 SHA-1: d818094418fa5e4c88ddd3e4b10bbb75795439da SHA-256: c988c30d43d67472cbf9b1e0e37c6942f920c5a7cf57a5afa04749ec91fa0658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lure users to external sites, likely for phishing or malware delivery.

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0fdggcv5sdmcq6cijoq2qimdf8/rijodawasetufu.pdf In PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/93181236332.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1c4d5a2acfc5dda4002691ba8881ee3b/mimawigitemovimir.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/baxamogotolezawafozam.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50e52618a---8031003036.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea105d0b1d---24239930442.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xetal.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/23609209006.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jig8fi8ur9f5vv9ai88sm4es1p/83113821204.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/24469772465.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/46216117490.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/daridulejogafob.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/31695067777.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2895e8a7---vojosuzedanevisam.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/getodejikix.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vasikomub.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a23bd1a1e---63908987980.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/tasedulejosobale.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/ledokunepufikag.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dceab325d---gudoboda.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/48cb7c5d1dafb94f99ff8f90e5930fc9/nipifulikufidalegemul.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/fowajoxi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/1452535959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gabriel%27s+oboe+pdf+freePDF 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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 17316 bytes
SHA-256: b00af6f281d1f4ed081fbbee666e5401475694d9c963a421d10db91335a477ef
font_02_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10500 bytes
SHA-256: 50ae4b9e0dab529c4262348a0ac27c295fd1577e39c4713332ce4d6192a31521

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