Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba991670443b670…

MALICIOUS

PDF

87.6 KB Created: 2021-08-03 08:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21583ab2f3d61cc179af32426b0bee22 SHA-1: 97ee425c174fc9b90b09afb7b00e36e30dfb6020 SHA-256: 9ba991670443b670423b9e54ef157f4ac1052630336f93efea2effe88e377506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were extracted, the presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6eb82fb22f3400183303aa1b15258c44/20628010662.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/69698962066.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210707232253.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/timowepisivedetubil.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/tufodoborirup.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160796777376d5---lokemit.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f0453fdf7---fikida.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/panad.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jelob.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadd239418---34233477846.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/89739977765.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/16178111535.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/45261496181.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/44398665112.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/bulewirelebeboreleturi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b850832f90c---vudowakekoja.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/40736263698.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838319b2b9d---defogogez.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/80915823493.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/nuzimaxunodifokarowinos.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a9009f2f21ccf26e6c81ad5ae2ece6be/75087455507.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb31944460---32464859957.pdfIn PDF document text
    • http://edgecs.net/documents/kadugupedij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=50+tons+de+cinza+google+docsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 21560 bytes
SHA-256: 72504342d2e317490727f974b6250e6c6e9113e2afa622a9cb1876bd17a7f274
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 10664 bytes
SHA-256: 235ce253671f3e6d2076df25f378f86c4fcdfd6102a117cf9813b3b998823b3f

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