Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8626acd68bda25…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 20:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d60d734751e88df6e4c4a7e33e3e9a55 SHA-1: cba36e62a324d4eaa685a94bb8386fba504928c9 SHA-256: 7c8626acd68bda25e169604a2d8b417d4ae58a6d9f7cd1fd6be3c6ac4530a81c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites, likely as a lure to download further payloads or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb6819a9df---bopino.pdf In PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/sovupu.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jugisazixulivegiti.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/xigogularivudorowewuradam.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aad65dbc6d4---17802943874.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/63744360035.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/1826709812.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/t4c8h8fd4oecr5bvbqee5fivl4/23975257700.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19cd435c9c---jevopegenamekafubupofiv.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/bipekogovuj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080da1604fe1---88985891910.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/75898944820.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090772c62c16---98055403131.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6968f187---jifinerisugakebozaduz.pdfIn PDF document text
    • http://hydrem.ru/images/file/53189763797.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/70903881051.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609827b5b363d---2633442515.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0131e9da5---jukumijabexinobif.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c962f13bf3b---74402094365.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/29304635951.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be493084c23---49288675692.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/negixinexixowo.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/38315413035.pdfIn PDF document text
    • http://guowangcable.com/d/files/22331872143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+sites+to+download+free+booksPDF 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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 17440 bytes
SHA-256: e25ea5912f7020d0579adb107c5f1c3db6bb76152ce804e9ee1b8066cde3f355
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 10716 bytes
SHA-256: e0885c6bcb4d59b5c444364229ce4282bb4d69d37c7acff16b7d8fd6a6a6a7f1

Open this report in the interactive analyzer, or submit your own file for analysis.