Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f43d1792aeb1d38…

MALICIOUS

PDF

103.6 KB Created: 2021-07-23 09:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b40699e05d7aa995f6e3b1fc58c36d5 SHA-1: a40aa92010f0e240f03a66c73a1334eacde42c40 SHA-256: 0f43d1792aeb1d38b10cd8bc8c110793e98e8e5362534b573f3ed7bd3f3e2ba8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://carlojans.com/cms/file/silikuxorolonofefanoso.pdf
    • http://allamericannursing.com/userfiles/file/karirisix.pdf
    • https://baptistfriends.org/media/1767305572.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0c834419d26cd7f9207e6941ccdeaf54/88195614497.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab37499d0be---28131783053.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe260fee9---fozutuvikab.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7bf6fdb16e79224db04a29eb51fd6d3b/51170821425.pdf
    • https://bushregenerators.info/userfiles/files/83889265478.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc77d2aeeab---jekutetomegike.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2c6b5facf---51728342151.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/620bcb1b1d752a18b7775d3aa12851e8/38976294884.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f289084f---84452177242.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d23c495c---xotuderusuvarujama.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa495166e19---tevigubetabulu.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/vujokusaverunikowikoje.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/536410159fff3e8e8317c3703dd5b4f8/lafonazavebujibudit.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/kififuwulebadunuliwe.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e400d3781---fofuzupikom.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/lowuxifoxoninezewup.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/13599071743.pdf
    • http://pinxedien.net/upload/files/wimejivor.pdf
    • http://mea-travel.pl/userfiles/file/ripizudimabug.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d50ed87ed460bdf9bf54c21087c09211/gepowakusi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e0c6ee6---lanuwopexibidafi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+constitutionalist+party
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e71.bin
137f6efdb11e50b882a4ac65f13a8636d7350ffc3b588ff88a162d70c9880901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 18504 bytes
font_01_sfnt_off00013db8.bin
117631fb1f7fc78513c1800a69d85ee80d807fec398e49bbddcadb6d2e5cae5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 10648 bytes
font_02_sfnt_off00015617.bin
f95cceb297353fb23c54cc25c75ec0df4e1ba9a1c74c1ec6b51122870b744f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15617 19928 bytes
font_03_sfnt_off000177a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177A3 16792 bytes

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