Malicious PDF — malware analysis report

Static analysis result for SHA-256 806c4c4764eed76e…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 05:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d0ae0a80b3f7c99e81847067f1498ec SHA-1: eb696127b36cbc8b8bf594db512356f547b9c075 SHA-256: 806c4c4764eed76e8687c00f08234ab494ca873f1841a1b1d83eee8998cb89f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's purpose is to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608176a9db31f---28073397867.pdf
    • https://kingdomdatesuae.com/userfiles/files/finugoritujoraponavidital.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2ae197df65dd7fbca201ecf3279498da/11460538866.pdf
    • http://www.urbanwaterways.info/files/lawiz.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6721dabe---bavizokasunakazelagow.pdf
    • http://doks-films.com/pcms/content/file/tavukofufu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a182bf3c3b5---wutunixitemixu.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d35655fc6bbaa2af72174b3091462d59/voseziwifabulugon.pdf
    • http://burfel.ru/upfiles/files/notifit.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a5ec6c65---nazumubawikotuwi.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c7528c952c04f57dbf38ec3d9b66ab8b/gajapigifiroz.pdf
    • http://iphysiology.ru/upload/gamezogo.pdf
    • http://arunimaflavours.com/userfiles/file/19187504287.pdf
    • https://betenagro.com/sites/default/files/file/pinakebufodejevutaz.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dded00690c9b9ddc0c387d256a318cda/3329748829.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/902d67211208cf64a22a0798edb7f947/zefeworeko.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/af5aa35be3104ac94ce9e75d666f293e/30227827843.pdf
    • https://adasms.fr/userfiles/file/81641218196.pdf
    • http://adabaskimerkezi.com/upload/file/diwigujen.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/524d39a38a4e749f5ac0bcb219d6c767/81632872949.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/65005350877.pdf
    • http://tpdw.pl/userfiles/file/95660610591.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87e08a3d5---jokadufuvigofe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hs+in+the+groin
    • 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_off0000e9c1.bin
1c173589a9723950277586ea157263af9500642534fbb546f45056251dbef277
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 17456 bytes
font_01_sfnt_off00011759.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 16792 bytes
font_02_sfnt_off00012f70.bin
47ecf4e115907a467f003820a4a2dc7b1343e010e196fb10cf9ad96f0d73c935
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F70 10172 bytes