Malicious PDF — malware analysis report

Static analysis result for SHA-256 502dd4b1bb7e45f6…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 05:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 511a0c19e93905ac76265399b51f5c22 SHA-1: 1216212aa3d416c07e63f5098f73dcd675485506 SHA-256: 502dd4b1bb7e45f6e49bc5c3a52d15d3f5218f653911e6036213457940114f30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to WordPress sites that appear to be hosting further PDF files. This suggests a link farm intended to distribute malicious documents or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the structure aligns with common techniques for distributing malware or leading users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c48364a0e6a---68619969461.pdf
    • http://www.prieteniitehnicii.ro/documente/file/22649035180.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b685cc9ff7---niforivadawaweriba.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fexuvu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb640047f---rabitoxuzizosumijuledogap.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/88937728021.pdf
    • https://ludifrance.fr/userfiles/file/berunezosasexafu.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c9918cf476b1478b4b3711d64541ba07/15684358463.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/80b00a23ec1daadc6297a49d5ac24867/vofesojorunuwilebulimadom.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kjrfc79fronbb0ucfpag9hvjl5/larifugu.pdf
    • http://thangmayedex.com/webroot/img/files/81053747896.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2b854a5---tofifigetosaro.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eb8dd026fb7352783d760ad53ebbe004/jaxodedabugopu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/u6mj1162v8g5tfhtdari7j8jcr/jiwasidotinibiforowirebe.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c216cd42d---56075436066.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c59f3278db3b691c0f73eaafd82c6b84/bavolobipup.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mol2jmvc46olp5pmndoegjgub4/pewutuxipezurejasij.pdf
    • http://chretkinia.pl/userfiles/file/34215764676.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/6p6v6fsqj1qfqq5idju32b75c7/17211150469.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ff1098f17a774a695f02943e1ff8c293/luzekifufudodixorimane.pdf
    • http://rotarylaspalmas.orgdocumentos/file/bewusanekoxeladajalefuzu.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/366096e419e1f2c6bd4d24a5c0ce914c/jedonorunokolavofez.pdf
    • http://casier-a-bouteilles.fr/file/xeroximupowirikiwujoguxav.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074920de78b2---29226191823.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=largest+gland+in+the+body
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16792 bytes
font_01_sfnt_off0000ff09.bin
e27241de8cdb111032ff4aecc6940f41f1c1b40bb2faa68dccc0461200d834d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10736 bytes
font_02_sfnt_off0001175e.bin
072d7d5fb4116f4f246da7b8b879c4fb59d3d7e4f39f7e85eb616a8d26b45797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 17988 bytes
font_03_sfnt_off0001463e.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1463E 16100 bytes

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