Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef1227ebfe2c786…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 08:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52446bdf1f5e4501c09f2e787cb1eb76 SHA-1: d15c5a1d0d112beef5b13f12ecd97cc5fa80e054 SHA-256: 2ef1227ebfe2c786339030d9ea5a8b3cf5de4ce84232cc30f65f24a97fa85ff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into downloading or interacting with the provided links, likely to obtain a secondary payload. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://uhy-th.com/image/upload/files/9241696354.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a283b829993---mozejadikoxema.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ee730790---42109532790.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/zojogagorutakexozuw.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/31410078845.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/turalewularidutusi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160775298812c0---xekisemi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/95817862775.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/wuxirobig.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kutoxuwixulobopoboku.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/98078999432.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a4abf4ba---52754619074.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/gujuxupexabewujuvelilab.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nccervi90egbfksta008albrq4/wujuposelebadowetubugad.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1091a7da---45017206741.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/pezabufezoravuw.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wesoxefedefudisatir.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bbfcd1a5b---xelulizilagejusar.pdfIn PDF document text
    • http://apsons.eu/files/file/loret.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/dimipitosukinajal.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878273dd6---vularulisumezagotule.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41408812350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+document+to+excel+spreadsheetPDF 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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 11092 bytes
SHA-256: 2a841ac6d3aabe8530b854d5a51ba72eaa7d674189107bdbf4815103c9ad5cac
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 18128 bytes
SHA-256: ebd296dc3b33faa0f924fdaefd1a4547c0d5699bbf2b30f9e95a501967a9b447

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