Malicious PDF — malware analysis report

Static analysis result for SHA-256 356b0b4fa982a29a…

MALICIOUS

PDF

79.1 KB Created: 2021-07-01 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0888dd4bf3423f512d5172a4b97d66ee SHA-1: 08468153cd0b999993aa327dc94499b7c60855e1 SHA-256: 356b0b4fa982a29a2ab6bc7595b6044f3623f270b6632efaf5b467056d992467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://allmedicus.com/userfiles/file/85086824490.pdf
    • http://amandatravel.com/userfiles/file/borulosatosijixufigup.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e497622b6---75823604337.pdf
    • https://airbays.com/userfiles/file/sonutuvisugimenetowefev.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd5f40888---26618717056.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098352bbfc22---7380030041.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5ba6e0f8ff6f760e6313897028d79c24/33729629918.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1738b03---59196639659.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ae55474055e915d3960873efcf03ca6b/61457947758.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a276b42d---88232471414.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d68273788---1942745474.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b35f2d631---gomojuxufexe.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c57677457b980a670835e4c6ca76b906/basamexurevikuremula.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d075cfcfc8a---livemime.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfb1ce0ea---45570687912.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3qqma44rqh6pssa9mvj6kfu376/dajevexa.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1837f028d---1197469452.pdf
    • http://jarosi.hu/files/file/mozojuf.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c1li2a7gho72vqogf6khvn5k5u/77558046581.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d3f9962ea24768e9e839812c3b23a67d/70902667631.pdf
    • http://dvarenda.ru/upload/file/bapilemopewepeki.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33b7707b3---rasawaxewaredufa.pdf
    • http://planbmedia.hufiles/58014002410.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f49948ahfkprt3jfhuegq1262j/kukesomijukipir.pdf
    • http://sbstroy53.ru/img/files/87881079654.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=grade+8+math+diagnostic+test+with+answers
    • 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_off0000d42b.bin
12237d26c52094cb49ae4a6dbcead5f7ea63ae12516b69a0fb82a8598f4c332d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 11104 bytes
font_01_sfnt_off0000edce.bin
df1ade75ea04dccb3cbb2f778d1644636872150e36a3a99e5b62a1be8ece3388
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 15920 bytes
font_02_sfnt_off000116d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16792 bytes