Malicious PDF — malware analysis report

Static analysis result for SHA-256 c981ee68507ed00b…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39766fa9119a8edf0f07068df559e579 SHA-1: bdefbe0a7529ab1ccb870c99ad5782f42287c6ff SHA-256: c981ee68507ed00bf60d2cb209684244ca4084afb2c7f3f966a2875c179db52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or distribution point for malicious content. While no scripts were directly extracted, the presence of external URIs and the overall heuristic firings suggest an attempt to lure users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1cb951462---potajexipepin.pdf
    • http://vitanova-cattery.com/upload/file/12502208117.pdf
    • https://adasms.fr/userfiles/file/71506548530.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8cee513c41522383849408cdab733796/58204092221.pdf
    • http://bebelino.ru/userfiles/file/79449301739.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r320v6n6f7vfcckslifu88rj76/84626938743.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094130cbfb---99795008266.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d83e4525---menodevovonigevubin.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ee2kdcr139qksq7fpqokc0os4/delokuwojiguvijokodukeva.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/55e9ff3b63d341ac7492e88bc980994e/93114719708.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de51ed6f285b485b6b88b201ba2a4be/mutalijinupata.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/gmk9gnrmeeiefie4hns9jnrvc6/1479473299.pdf
    • http://skupka54.ru/upload/m/60475485725.pdf
    • http://beveragesgs.com/userfiles/file/tozuletum.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c0f40a6c---xigabaxun.pdf
    • https://stopserv.ru/files/file/68852512609.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7pbt01smts3ld0smuh6vu722sq/kibujegubukutuvad.pdf
    • https://ochronaskory.pl/pliki_user/File/37512249103.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2842a4fe---liwiromazekitugatapinug.pdf
    • https://stancijanegrin.com/UserFiles/files/27280391863.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/91199928054.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qndnhfp6sc6pmtss8q8tunkmp1/venororamelikosebaxanopo.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/fakutipiguwepez.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c71099ccca1---58019949213.pdf
    • http://myexamadvisor.com/fck_uploads/files/56369817952.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=5th+grade+opinion+writing+prompts+with+articles
    • 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_off0000ff78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
font_01_sfnt_off0001178a.bin
d223ed49f57bcff799d4493271ef60665c83887cd22ff0655e496fef38e6ad82
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 17744 bytes
font_02_sfnt_off0001455a.bin
ca8e17fbdec23bad2670a8dd78455d6314e4554723a2672093c024c4010e4892
pdf-font-stream PDF embedded font (sfnt) at offset 0x1455A 11084 bytes