Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b6043297363710…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44d18939ab8d7658994dca7137f2825f SHA-1: b49e0397d0b3cc26bdb98286ccbc575d7ae0dae9 SHA-256: 84b604329736371062d4cfa377a4a1e5eb9781d40bed9526f5d85bee312819a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=dfa+problems+with+solutions+pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7d658b568700edeb2f127fe73bb078d9/xotefirenopafabolibimu.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/nipuzopepajo.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7519875546a8ab64409d71b2dd353b31/20016051708.pdf
    • http://apexibd.com/uploads/fck_uploads/file/duzaruzupitaro.pdf
    • http://zulaikhatextile.com/userfiles/files/11212286805.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/h535jet11mmqp5ctacs7ifhsav/42456171468.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd131b292af---94266657637.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ea40de26bb13bfb6f54fbecbddbebdb/sujupa.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/akvvpe01r9bv14ah9j13m9qns4/76340439031.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c7851f92d3a---223205652.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8abe60992ab0a075ec1c10d448644947/simejox.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/901a6fa4449997d6a9f9b2ad6dbf0fbe/5093460317.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406970872c---rabodavogeweba.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/11615d729d3e94d5892239dbf1d1b104/13730958193.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9168705936---fadokodizininoromuw.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52fce5974---22807593746.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7e98f428c6932c5b5cdcdc305156941b/8055700847.pdf
    • http://beijingxinzhi.com/userfiles/file/20210518144827_557953997.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ab329e0---31980755379.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160744c56eb6d4---zoxibudefitovigilano.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ea428e830456b6a315bbe4719f045f33/bedakuratiwane.pdf
    • https://p99.tw/pro_pic/files/95966233559.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa1b8f7a0---ximet.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609022eb346ac---jiwujinizi.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_off0000e9a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
font_01_sfnt_off000101b6.bin
e6849ce2e4b24f1ac0a9aa5974c3a5589dfab0765dc83f59caa55a385b584027
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 20096 bytes
font_02_sfnt_off00013863.bin
2682e7804f175e685387564c9550e2dfe3983d1ac548311e7c8342ecaed5ccc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 11092 bytes