Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7c6debffe3769e…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 06:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 244ea82bd6df2c6b6dee9157ad305ac4 SHA-1: cb8236f2b8f844793c0d2334b1baf1768b3182c0 SHA-256: bc7c6debffe3769eeb9f7d8e5cf2d2a7330cdab9cc0a374b709ad98cab38d543
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings and numerous URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae738201---65369218329.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/79066994772.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/18ce209ea4aea551b1cbf9dc8e1c68c3/58282860206.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b0019b6aab8921eb863b53ea1d31d69/95576594572.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9si1rflmqhrda4dsqq7hrc7ne6/28889879739.pdf
    • http://daiichilogistics.com/uploads/news_file/manuwivaz.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a725e98b---13310486776.pdf
    • http://armanetti.com/images/83013787528.pdf
    • http://fw-simple.com/uploads/files/66238941796.pdf
    • http://buchtel1967.com/clients/26382/File/88458501793.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7b34b9f9274165d9c5d70fe1c9b1590f/93712060503.pdf
    • https://alteanetworks.fr/img/file/zavorafogowagoloxora.pdf
    • https://everestart.com/images/stories/file/28196491067.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f491a69c---ranirareximej.pdf
    • http://eros-arena.de/eros/userfiles/file/19450722719.pdf
    • http://alpha-cp.com/userfiles/file/38027530.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7dbfaab79376dcfc59e4a5a5fcce6073/kuwowanowopede.pdf
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/guxevuzobirenoxuned.pdf
    • https://nhakhoaanphuoc.vn/uploads/files/88041218931.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6b68e23---gemizer.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b51afb256a28d24a4ba9e09b4a3fb123/2028612112.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8629f77983d519f29c63d3bc75b16fa4/91084396402.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0c2749a6da934860433820a2e95d6acc/tupesapexatogenowifis.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/16af4872ffc22a9194a1c4e1c637532a/lexijufelaxogej.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22e692549---52774273877.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083104c615c8---fexarerewedejow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=coon+hunting+jokes
    • 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_off0000f899.bin
e5a79d0d4219e4602a8cfb8a0bad38cdafbd77151b483e05fe030d0d9e1f5a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16960 bytes
font_01_sfnt_off000124e5.bin
bea9890103bce102504e489fc4d00acce090d756b5563e3c5f4347e7fc386d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 10432 bytes
font_02_sfnt_off00013c84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 16792 bytes