Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3ccef6b252f18b…

MALICIOUS

PDF

93.5 KB Created: 2021-09-12 05:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ebba0bf48e476ec74aa69b78fcfe949 SHA-1: b49de634d10f55f57b431611b7796d683cec2934 SHA-256: fd3ccef6b252f18b66e6b8e9ca497116c3561b09e94f96bd9c2705f313beef2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.cavice.fi/tiedostot/files/fabemosazi.pdf In PDF document text
    • http://globomax.eu/userfiles/file/todigelozog.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/22616157971.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/gusisagemixiv.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/momuzimipuduvasizemufu.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/14049662852.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/51955938016.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cff323a40b5c935f5a7b87cb508a3f60/rokenirofurajopawu.pdfIn PDF document text
    • https://avela.md/userfiles/file/lukok.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/58893444665.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/rebegomolasomabutupuxav.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/8464262506.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb536db479---pureluwafesenusivuvotiw.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/94783463341.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vetesunevirinodamo.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/tovifikito.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfddc2bff---rusovipunozolozufor.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/78600077015.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zumemejirevag.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/55604363329.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/41601847375.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b515dc1eb0---zagufekamilelirawufov.pdfIn PDF document text
    • http://hk-keber.de/images/file/28033647862.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/xefejiwawiwemifawafoxo.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/75793855966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=idle+home+makeover+modPDF 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_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 10160 bytes
SHA-256: b22db288f3524f80ff1870b340fe37d40423eee639760cd978c367b4c300726d
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 17108 bytes
SHA-256: bce33993b53668ebee88b12d3052ae77deda7a01d89a8fd707b512156faf11e3