Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a490ae508c767…

MALICIOUS

PDF

86.2 KB Created: 2021-07-19 03:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a90607857f9d0dc52162c1ad36016372 SHA-1: 4e16ee18c64d3774893f391795c40550495d97dd SHA-256: 888a490ae508c7679c6dc9c11da039ade0c2e98e417abf6a777b81fbd3f71a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/94a06d2681d54ce191c255609d6e4aef/75412510891.pdf In PDF document text
    • https://avayemehr-carpet.ir/data/file/xuwuzozexijarozoka.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7qivrmgkhid2trh2m0admgme7i/17787769791.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/kugixudemuzokoloragejoba.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/cd6jpji86pn8chg67cnfllf7h4/tibupigimageromodevom.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/wurupagure.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/24bfeb6452ea6788bbb6177b8a651cfc/pikofol.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/70626333310.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070410450870554.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pokefatazaros.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/93049548177.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3560e811d8d60099dc2fae477adffb6e/91050682010.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wizowakaz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7446eb9d---zubapebeganebevigibisu.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/visepaxowamerumoligisibun.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/xinomowuxino.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9135069a92befd29db90b76a1e218d9c/48663894676.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f122b5495d886d95cb3846f99524f429/81231910337.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779e3706b6c---jejafobijinamamavinanot.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/momajox.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/32hovgtsu6l8qkb71j5t5if3cc/nivefokupesovazezijiz.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94feee804---gibesedajanojinagabaz.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/92110883913.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946f4be86a7---wivasovederavujefewobideg.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3621e9767d59913b6b51430778bb725d/76367483090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+fire+diamond+hack+version+download+2021PDF 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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 11160 bytes
SHA-256: d0ce5dd35403576fcb6a11f61e6b26c4efe5503e58a4abea4d8f4e1a2b9fcd65
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 18440 bytes
SHA-256: feb18d926bf854113dbb9c8ed7e0e7daa024ec324972b1b9345a36ab1a14549d
font_02_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1