Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b4f57111364987…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 10:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 114947287aafa55e69a3cbe491c3ac44 SHA-1: f2f238b66c8aed240b4d8f5e69c99450f19f1843 SHA-256: c7b4f571113649871815030d8b5b7b1ae9992b98342baf75ddaf0c9cbe32bc92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised Content Management Systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The file's structure as a link farm suggests an attempt to distribute traffic or obscure the ultimate destination.

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://vieclambanhang247.com/upload/files/64156510175.pdf
    • http://akcjonariusz.com/UserFiles/file/ligutewer.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kk3vrdpt0n6nbk7tu8po15867u/jirupotawiwefog.pdf
    • https://gamasteel.net/userfiles/file/lovafefuseleluvuku.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/fuzidebiken.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5f54f564---baratavenosidabefofovuku.pdf
    • http://hanhthien.net/uploads/file/58502790020.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/47452714077.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/68e167a9b517936417c01d07d2294d92/46714634976.pdf
    • http://elateridae.com/images/FCKeditor/file/63250219282.pdf
    • http://www.hydro-tg.pro/upload/file/midenofosegeziver.pdf
    • http://sunrui-ti.com/d/files/zobiweb.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tnlkd22p5be5uvkkqepnv4e73c/78982329489.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988b8f40d2c---babomemozufetoxaruletomu.pdf
    • http://beiwendq.com/userfiles/file/721168829.pdf
    • https://karinbentum.nl/uploads/file/82591814011.pdf
    • http://prodottoitalia.eu/userfiles/files/wuwegupufazasewud.pdf
    • http://panziofabian.hu/fck_kepek/levupotosadilufivakezoxel.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb65993d1e---14682086037.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94c7ba6a9---siwatavuzu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/60ac9d9a3646e77e8c03f165d041432f/wuletepuwolefozutukoti.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gsqf4d2u4kk4dckukubretf10p/6463474701.pdf
    • http://diversecityuk.com/userfiles/file/dujomalu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f915d454c6d2df3e0e9477735024c1cd/zoginonotizi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=william+wordsworth+i+wandered+lonely+as+a+cloud+meaning
    • 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_off0000f01b.bin
100ee0fa0d4568799cb633f5283e2b3ff74b3680cedae9cf709f37efa2ed51be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 11112 bytes
font_01_sfnt_off000109ae.bin
c1900de259415b012a6d0b7dd5bca52d27e449454b19ceeeec79922982b9014f
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16292 bytes
font_02_sfnt_off000133d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 16792 bytes