Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac2ebcc4b97c43f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-09 10:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e11b9d0626dc1cca87909064bc1c00b SHA-1: a403e64ff9eca6084cf60947c0e09586ea135294 SHA-256: aac2ebcc4b97c43f7be43ca43164a2ceeffcd0081bf065a856f466a6628df2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613295284d752---juduxopog.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://oskarmak.com/userfiles/file/zalixijalugoxebu.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/mipedefakeg.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/jabofojedugoxarole.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613295284d752---juduxopog.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c325341b---wamupikigalaki.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/buvezusulixikowowapupi.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/ritatesudamaxakeganife.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mupoviwuduve.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1d4ac421---tatexudizura.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xuzitid.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/kijikukanali.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/dovibovodokedajabovujawi.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/73816438514.pdfIn PDF document text
    • http://e-menu.hu/editor_up/82737406180.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/91874920397.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/7847509947.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29fe5cf79832ff24ceb138fd9e8ee586/25287558038.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/somoxorudilobupamifezetiw.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/96117002499.pdfIn PDF document text
    • https://menu2uplus.com/images/file/77527259517.pdfIn PDF document text
    • https://masukpt1.com/contents/files/53899383335.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613956a2d2fe5---87588427116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=electromagnetic+radiation+of+wavelengthPDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 14716 bytes
SHA-256: a7c10b5f4e259199cb6cbe3d9b6c0fecdd33edac14f6c9d00ae2a4197375585e
font_02_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10888 bytes
SHA-256: ea7e2528556cc536b7e9562dbe1942e7089a463de9af34e2488c200394ff83a7

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