Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c830fcc1e1cfe43…

MALICIOUS

PDF

89.1 KB Created: 2021-06-15 10:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38095b1b8b2e1092229b5e73d991371e SHA-1: f03e6302b70cee192174f2ad21486ee795fdaf7a SHA-256: 8c830fcc1e1cfe43108de5444cb325d6bc6e6ecb765fec413e3c95e2528c4221
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or scam campaign. The presence of embedded URLs and the 'link farm' heuristic point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=treasure+hunt+clues+for+terrace PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160727d555cba3---87927882446.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/1f2e45019650a7612824b982755d8005/38214842888.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/31135383064.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb89b281e---92748984952.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tigipikulisupefukuwoxumur.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b18d32f---peliwitelaxomulewizola.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3ffba3da154d0dc327697072d66fc29d/sutopi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914cf6377eb---23933409150.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/31456668090.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8d77hsrq0ggdjj8udcrpeje75s/kodegozok.pdfIn PDF document text
    • http://brukbet.com/user_images/file/menasazaxubudikuxaf.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c548bb611bd001fdf03c0ecebfcef392/5865566414.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081b79bb8725---lodulebu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8eec917037fd60b610d87ce514e786f0/zofatokaxojiwes.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f293f80e---tugudewugajodexiriv.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/58798735792.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vajolalubavijupen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 4916 bytes
SHA-256: 9a82be72c1c05c032755fb72ff246de450e6ca289c1ace55dd4e8ae4b833868a
font_01_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 10436 bytes
SHA-256: 99dadc59c6ccc21bd13dbb9a21db7cab3cb446edf32fef348d4d2a38208a1690