Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e667d7d97d80a5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 08:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cb0200d4e7c88e4bf615c1ca38bfc77 SHA-1: ad3abd1304a683384c2e9abccc3c5a8afe8c1434 SHA-256: e6e667d7d97d80a5eda4e65dcaa984ee087caf3d45b3f5d6a4ab8cd5f322a6ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, and the document body was unreadable, but the link farm heuristic and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b25c1914f475e3eebff5d68cb4b3f30b/69644968790.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/voninalilapujagufozud.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/90600223054.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1c02bf9e---nopoxudulivusuwilij.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9ed3b3d56480c601a20386e29763c2dc/tomovovuzegugidig.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/45646044492.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/64873837338.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zeradegakokutixekituzine.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/g8l2au60s97sdmj7e8d60hgan5/15389082790.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/33886440435.pdfIn PDF document text
    • http://bjjiffy.com/upload/senesasidonudotiriz.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16095f81f218ca---balikinog.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xikowixul.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/figaju.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b918fde3f8a---puliremurugorijeguj.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/39119623711.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3oqaiukhf2738a8ifj0i7tni4c/napaloz.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/66117350053.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/70154424218.pdfIn PDF document text
    • http://nfc.soo.jp/file/85068740996.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/t89di7rnusi3eho41ut691nh1k/neviwaxasikivedewima.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df93eecc5---vebakeposigizunitelatod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=diseases+of+central+nervous+system+pdfPDF 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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 16408 bytes
SHA-256: a05e3261d7399a16a4ca163792c960ffd70c7b171675b29e5791a5d57438e288
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 11064 bytes
SHA-256: 6bfeefc3e2ed2b7e4c00ccb6ca3189d352bcdba6a0cfd92243fd1bcb9fe46feb
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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