Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb84fc6ca9914e4c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 18:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8c867e6c226cb685a42275f477d4900 SHA-1: ab51de39905737aa2a955e71204d373cf2677b0f SHA-256: bb84fc6ca9914e4ca459ece3feb93966fd19bc063950418bb009968846ffa202
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=how+to+hack+wifi+with+android PDF link annotation
    • https://mediaget.ru/userfiles/files/49071753508.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/69908184029.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/71454615223.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/jibojugedafiwelivifosutel.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/60684281028.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f42cd4d7441aaed6c55271a80b0f4d3/13425019217.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/77909563827.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivuduzuvi.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82488103039.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50c980e15cc93369fdb95512bd5da967/nomefagizawuwovusefevipej.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3c96cb8e---tiwosimipi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139278c38d32---kozazavisirotumenegubasa.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/23917040878.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/larosipijuxonodupera.pdfIn PDF document text
    • http://wigs4less.net/nbloom/fckuploads/file/bodevabufo.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/likudexoxiwonelopiximus.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210916095129_1dsdmg.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kezarowatomu.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/11634353827.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110516216772.pdfIn PDF document text
    • http://fpole.ru/sadm_files/samamezulel.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/luwidaravezaremawaletefa.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/53245432328.pdfIn PDF document text
    • 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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10396 bytes
SHA-256: 9c0b5fa518cc6dda908c02acc3860b3914bbf2844a97deb9edbea40ae893c322
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 18168 bytes
SHA-256: d447fdc3bae942e51dd78e254714475b6364ad854c471b9a21d502d6ff24ffeb

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