Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe87822e8f3ba7c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 06:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fee4527eb579affd0556164888bf11a SHA-1: 96640d424439472c1a30e90c6348de71015668b1 SHA-256: dbe87822e8f3ba7cd443bd03506dc0ecdad17ec769a50ebd8d10f36e5c5632b4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host and distribute further malicious content. The presence of JavaScript points to an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8cfb2ba86dd201f1e2d741c1b548c277/lavokixoxade.pdf In PDF document text
    • http://ros-grad.ru/fck_editor_files/files/64142446236.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/winafi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/717bac5f023ffef7a941ab5691b27094/32774181200.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d75e0c7717e---gexixupex.pdfIn PDF document text
    • https://migger.dk/userimages/file/sesopapavapuvi.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/91110743438.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/fee74b7d74b9855405eb9ef168fb2607/89631872140.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c815bcb17bfc4ff4e46dc5f41268590b/64996970422.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/jagixozazuvimojix.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071901e7e049---47491222055.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/paresegobadizakejibepopif.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/dixenalux.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210709_92CEB058C80900E5.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jafimoluruwuguxatemoboxeg.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095b51b76fdf---19396751199.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8470b3544---kadiworarezonapimawinebe.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/40425161843.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5c2d059a1307721b88bb3969d7f0518/segafoweresofilamu.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/66609357247.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/84d41d698dda36991f8268aea752b255/71245448903.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c858123cd7b---21736886329.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/11069901349.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ada607dd---juzep.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/773004a652fab67338ce3e582bfd6f10/97919689527.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0kiiap3jaaf3lu2gc0d5l5pi6f/fifisobekop.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sirametoguzerakuvorotore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=small+red+tickPDF 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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10304 bytes
SHA-256: bfc2080dc7415f770f9f4e27225dc2d9b7e0321fb8526a496ea8706a65bf726e
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 17832 bytes
SHA-256: c058cadb0c10a9be9ff97e5c7ab6c3a5a8715cb7dec2371b9bbe21d6b912caac
font_02_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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