Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdcf888871604ef…

MALICIOUS

PDF

58.2 KB Created: 2021-09-04 11:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be192bf4f0b530210ba1a1b6fd375642 SHA-1: 3c8b1b7572afbec720ab65726159aacd7a104a4e SHA-256: 3fdcf888871604efb1970182f4ebf3e36297ba924798b9723243ef9695596db9
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8004

Heuristics 5

  • 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
  • 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://narcisse.sk/editor_uploads/files/28937930728.pdf In PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/70967817984.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-29/20210829083434605842.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/75141386708.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7c60a4c1a6df905c90cba33ff756ee67/89148998949.pdfIn PDF document text
    • http://friulanapanini.com/images/file/47189722621.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/53bc21939167012c0ff3e780ee671e91/94780856819.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/pujimuwonesitogorerut.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tebirizuwemeve.pdfIn PDF document text
    • https://dpmceramiche.it/file/667395875.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b9hina5kalro63808qm1g2tcvv/62291728700.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/23e8125c29edf55c4ccbaca8aed6afdf/41182279650.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v16qdvdp0luntsejrj4ffto5g0/zesirekixix.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e9e873e2560f9601875f03b4f4c200d/81403713385.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/72095067701.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025a024856---13035573687.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xalimomireku.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/i00m329dhaso2rl8g89k2nvd26/33170043090.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/duxexudufosofaj.pdfIn PDF document text
    • http://ellev.fr/upload/files/83324421201.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/99350393637.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64b189fab---42318367698.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qkem96s8ck06eiunn96ga5t5f4/73315353033.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736a7b721f6---tesasosero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ncert+mathematics+textbook+for+class+10+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB575 15604 bytes
SHA-256: ce8c3cfa366ac6ed7ac7f9affa448eccb7761eebbd70e7f33985da8a8f68f17d

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