Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7a395016d144d…

MALICIOUS

PDF

83.1 KB Created: 2021-07-07 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef5757eb0339b145df30cb90e80ed45c SHA-1: 18459c42614878856f57033414ba85358bc9cc24 SHA-256: 99b7a395016d144dd724f874908827385c37c80386e9c568e673c822cab0ef92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0c9e6eb4aba3e7e09b52d0ed2370c1d3/xifodugereko.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/vowupevapogujebatidifamux.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/bipavupedebuviralokur.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f89c41de6---firejeropeku.pdf
    • http://www.benyowsky.com/resources/files/velisolopajefudevopem.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c2e1e822eee330dad2b18069d5e24030/gegebif.pdf
    • http://krikrik.ru/uploads/ckfinder/files/28438978758.pdf
    • https://elitstroycraft.ru/source/file/danupupukomub.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883361d30e---13136479632.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c241be6519---kanebasozukuxa.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/75533337739.pdf
    • http://sanzmendia.com/userfiles/files/46924349525.pdf
    • http://jump360.co/upload/files/20210607081609.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088079c817d4---gejizogafotazuxiloxo.pdf
    • https://kermoulin.com/userfiles/file/17253300256.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jhs7s34e13ef9tc7p1071p0up2/9314733540.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3190ca4c13109cf85f3724d6e81cea47/bikifugunadotarirefopop.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a0b5eb3b---71838832620.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/99871796570.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764a34361fe---10010532607.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1a4c23b2d---93842688592.pdf
    • http://agiusfuneraldirectors.com/files/file/pavejobamexinu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/adeaubahish0mdpp2ciqrtgr36/mefupeguwofapa.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe9fbd9f3---55255642347.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=prayers+to+the+seven+sacred+flames+free+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
font_01_sfnt_off0000f899.bin
9d6a1099425fa2869903c49db4b2840c1ecb6cdf95733a6a0a40bf719e3e63df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10972 bytes
font_02_sfnt_off000111f6.bin
c4ab01037443c10dd950cd32e2fe3bcf97dda8b38ecd8be8a9aeea99b3c54955
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 17196 bytes