Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918157c1bb3c615…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 06:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fed4cdfa5fc3ef4074df90d6f41ffcf0 SHA-1: 8075c6a062cf9bf6f636abd06bbbeca43457109e SHA-256: 8918157c1bb3c615f802b3dbede87d5ae18fa632038983099dee5bd514174d52
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates this PDF is malicious. It contains a link farm pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/btubpu3oae1kvi797fpv1l0c92/76960665990.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3ea2170d845634d32a0f1a76cd7c5c83/54823757262.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/jojomo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d534d82b62---24010175072.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b8dbe7f8---84485992380.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/gisewetuvepeledobaforela.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/leroratazenidopag.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/kikumowizebej.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a694bf6066b---66280451262.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8d54c48dfb9446bcda6375ce922261a7/31305419172.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e6df5e977e8c9a3e55d77ae0f3082117/xiwimamukusokedojulekiw.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tiruruxa.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/7957618117.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/99594122333.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609515e8bee97---gixod.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tiwikotowuzipufafu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/r1q23992mscgo8asl4tno5e0v4/fexosarafokizagovexap.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/72116168333.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a8854d6a---84710304505.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9cf900d5---totemodekugug.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079514dc20dc---65526795424.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021610447421357.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b22cfcec---sevozebupiwojarosel.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983476bef4d---pekejojiwepifetageti.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/64998722426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wow+fire+mage+pvp+buildPDF 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_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 17492 bytes
SHA-256: ba520fb79d8e1da10942f5a88aa0b246298dd3a9cf5ed619c40dca47b13c0f03
font_02_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10856 bytes
SHA-256: 3233df6d7fd3b585f22940b9e460076a0a2412dd9b1a70a850b780226dda3435

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