Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f0fe417b0a9f19…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 16:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54da3b0d74cc79f1c53e3b2203e06a60 SHA-1: 3243084ef4bdbaba22d3819e951b1a00b585c1e3 SHA-256: c0f0fe417b0a9f19dc6942605e67c424539d1200d2db7fce01394231d7fa34f3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The document contains instructions to disable security software, a strong indicator of malicious intent. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to host or distribute malicious content. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.marjojaspers.nl/ckfinder/userfiles/files/losejibe.pdf
    • http://www.gpe-el.pro/ckfinder/userfiles/files/72991725141.pdf
    • https://vialivonica.eu/userfiles/files/69029867585.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f71556024d2c5fd5384aa6cefd68fd25/79493690140.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-6/20210906145707271618.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/objrmbr4s0lgo956lu75mepouq/17874356831.pdf
    • http://diamant-x.sk/UserFiles/file/79427358742.pdf
    • http://tutek.eu/userfiles/file/guxabigupunedomixezozudi.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/54224414522.pdf
    • http://sgpeo.pl/users/file/kexegaluxuzudovebozafaki.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/mqbv2r8d6saqa92hburmv5urur3e40gh/95989198821.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/693278a35ec513f95105fdc645084e38/88467371525.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/2268560509.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/xebobubidegikagevazitasus.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/pakerosi.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61065331185.pdf
    • https://pernambucoimortal.com/imagens/files/20701967487.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/545a575c8c58cee49f2ed4bc0b620a76/gifotixaromutanurebe.pdf
    • http://dezis.ru/uploads/files/4685813436.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb29acdab---3185463983.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c322922f7---nejugowuserujeja.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/tawubesojajinomobug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=agarest+war+apk
    • 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_off0000dd1a.bin
5dfb98012615fc5978966646ed27199fce0a6584dd3edde324a4bba370a37c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 17976 bytes
font_01_sfnt_off00010b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
font_02_sfnt_off00012382.bin
066ebe908a8cb618d732236a17cf8559b52320fa20790a78ba723a025316b487
pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10224 bytes