Malicious PDF — malware analysis report

Static analysis result for SHA-256 1883ce5a0c1deee6…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 17:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e1a9a664d3928462c680c2fea8846dc SHA-1: 6f8c00f4d66c1a00e687effa03a3c2f5590281d2 SHA-256: 1883ce5a0c1deee6bd70a3172eff8dd810073f0ab0aff7cda417f500c4a2dbfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates a potential phishing or scam attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/i3e4m5uqef0fg3loqk0gfj8juu/fusagaru.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/94928149544.pdf
    • http://www.toptehnik.si/images/xinuvasozunitufo.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f68dfb42bed0006afe160a9e9d4ed2f5/33518770722.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vjieirardaed57q9qjja062cqi/94163590068.pdf
    • http://gillsandgeckos.com/userfiles/file/38498605838.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2e28f9fe---zixirikiviradojevided.pdf
    • http://brmhn.com/userfiles/file/20210529004747_228r7r.pdf
    • https://noithatkuongthinh.com/uploads/files/62944304727.pdf
    • http://aeronautike.com/userfiles/file/84300369270.pdf
    • http://red-persimmons.com/upfiles/editor/files/wuxoxexikep.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a281634b4db---sorarojuni.pdf
    • http://autoscuolepintozzi.it/userfiles/files/badusesisepegu.pdf
    • http://st-ark.it/userfiles/files/29782621406.pdf
    • http://banhangcongnghe.com/upload/FCK/file/kujogev.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/je8f4vvecp5gjo83e4h063pcm8/99296132411.pdf
    • http://rmgoals.com/userfiles/files/83588070728.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1f335ca66---nogufokizuku.pdf
    • http://teechart.com/uploads/images/files/20558927847.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/dfb827e6d5f3e293f199e866d16b12b2/votupijof.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608462c2389d1---vuxati.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=business+newsletter+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00011204.bin
383617f7fe3bf02087f0fb3964e1bcdd3a6960a0be37d7e148eea32feaaed62b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 17584 bytes
font_01_sfnt_off00013f87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 16792 bytes
font_02_sfnt_off0001579e.bin
f43d001e7541bfae3cd22351442a52e7f3c6fa9798c6fb97cbf23833d889d771
pdf-font-stream PDF embedded font (sfnt) at offset 0x1579E 10448 bytes