Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0af0547c008f3…

MALICIOUS

PDF

94.0 KB Created: 2021-08-03 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe6134b6ba0c7ea9f4b8a4480d11f734 SHA-1: 4ba13ecaad1d8737f68ba50c8f65adcd6b0ed042 SHA-256: 3bf0af0547c008f3bdd3a60f91145c8a8f130448976c5edfc32f695ca58b941a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal a link farm hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports this, indicating the document's intent is to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8ab5af71---dogifupa.pdf In PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/62661327173.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/96124074600.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/004c4eab9fe10f40fbaac23098097ac1/wobateneda.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/12150030285.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/latubekevof.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jubazudufumotikazidepez.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecde2a30677---73647298157.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cb2a1de7845c52d34d281695ac4a8eb8/50080019766.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/305def1c659c1977a6b79e500c052399/voranovunoj.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/5281710145.pdfIn PDF document text
    • http://donghotam.com/luutru/files/wividuverevazowusorati.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3a13001bb---gowinubasotelev.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/7281879847.pdfIn PDF document text
    • https://5udua.com/contents//files/98540333626.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d8c94a4340478fb274b6a244b92ce8ab/47220992222.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/80781760089.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/95609510733.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/moputinavalixowilopa.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/iqd2k352lg44fjdgtstldgdv27/wujorufew.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikofopirijeko.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887213bbe52---14073119399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=octopus+box+lg+tool+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 18624 bytes
SHA-256: 140a9e3bd6ea81b3f591fd145371ea3f75c4c8e7dfb8a1e2743cf3df8387f80b
font_01_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10680 bytes
SHA-256: d4b8a8a72a703369c15d06e2a2bea035b5314a9a986d64e75f592ad6e32d64ce
font_02_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001518c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518C 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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