Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25e996194194285…

MALICIOUS

PDF

87.8 KB Created: 2021-08-21 09:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa86e7049c234e572b9172aeb332e46c SHA-1: 4a27e0b2ba6d672178bea80b5063a40940244442 SHA-256: a25e9961941942851da53ab81a57501cd8a98a919ace82753aba388be8f29e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://askisan.com/upload/ckfinder/files/jidobipemewotusapowot.pdf In PDF document text
    • http://mirai-kankyo.com/userfiles/files/71118832078.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/zezawerapifawod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c70634670b0---jorixape.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bdb1b5fde4b2e03e218f961c86744b20/leluxupupanosewunu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/latiwo.pdfIn PDF document text
    • https://etadelloro.it/images/file/kokimamogevokanuzobotuj.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/80288846713.pdfIn PDF document text
    • https://anfauglir.com/images/file/78770717341.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/82919094355.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d49d1794---vewufuzureteguz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a228eb82a55---ninekapuj.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/muzesozixesaguwakil.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/kapenuvumuxok.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdd0cc654a---metetuxatekalovokutof.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/20206512127.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/87ad7b77010ab6a6b4ff75163513bc15/776072423.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/noluvunizunuraxumewatesi.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/10486611414.pdfIn PDF document text
    • https://aneri12.cz/res/file/dawerejufatixowonefutulow.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/5511878625.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//5889310994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bloons+td+5+apk+dataPDF 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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 21616 bytes
SHA-256: 770186f8eed2b169324de8ad9dc5f53371fab4027ac0a4d3d1d8bd360af26790
font_01_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10340 bytes
SHA-256: e2ce70e064f1af70efe0d9d862c72a0f3f5918d81fd2d04ff16fb373bc37fb0f
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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