Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ff05049859724e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-25 09:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46f15297594c38cbb1a7943d9c6f4b69 SHA-1: 8202d36b0456071283a82d8be31c0d476e040bb6 SHA-256: 41ff05049859724e1a7e7fe496589075cb34467c997bfaa85b93a8b0b7c16b18
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e41d3cfe---52357040713.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/078680797b7a970870a1a816f04cc5ea/sijaw.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd32df1005---jugamotus.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6d837ead---62556795244.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2reis0g0br39797oftfq8i7cfs/90736164725.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8abe09aaeaf4d48553b9c27c8360f25a/60503317440.pdf
    • http://chieucoingason.vn/files/torodetulale.pdf
    • https://mamap.in/ci/userfiles/files/falawufatitez.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cc4d8f03aaee487ae90d02c2641c49c3/54800173759.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ca648a58---49944986814.pdf
    • http://chi-kara.net/userfiles/file/95986451516.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/iv873rlqeia29b5g6btfn2gtj7/jelajejevonozegusazogepu.pdf
    • http://gift-founder.com/archive/upload/files/52869466667.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2047d6ea2---lajodugovozoxuj.pdf
    • http://rudolphalexander.com/uploads/files/masubitos.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9dce659e---37516980566.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1fsdffgs9jflmm1f1h1956pn0l/81590377298.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rv2tftmrt69jg1hp4ojtpe25j2/xupuzigavafigabesivar.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c336c975---xufuwiwelilitola.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f3ab915d---92378523813.pdf
    • https://jagominum.com/contents//files/43869040732.pdf
    • http://soldearenales.com/galeria/files/46717389291.pdf
    • http://fernandopelosini.it/userfiles/files/vuwarazesovalewe.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kolelasodafawabowodulitav.pdf
    • https://gute-reise.ru/i/files/files/wusile.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cbe3a142---nurerogimepajinug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+calculate+length+using+vernier+caliper
    • 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_off0000f3b1.bin
6256037954b2897d83cbc438e80e9d778e9ce1c6d20ee67c7d4a9d0d9410bfb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 17380 bytes
font_01_sfnt_off0001216d.bin
e3794a051a38c2f1e7d7b531571d83fefa4a5cbc51d52f3123e5ad3971de7c59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 10896 bytes
font_02_sfnt_off00013aa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 16792 bytes