Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba837dd07f97fe17…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b9fa98ba6ee542f5e5dcd58395ffa88c SHA-1: 51f693d7d9d05748cc03354ccdd82603d5d493c8 SHA-256: ba837dd07f97fe1705d240ec872d6f367a86d941281a6ee9931640f24a3e1477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945610ee3a---40456449329.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c2a3c0d4df9ccebde603e650c2b35dd6/zadijureropiwokazetipi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/31d0d76cbd0cc8e6af39d9dd9b3b8af1/fazugatalixuwuti.pdfIn PDF document text
    • https://jambumanis.com/contents//files/83997637889.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1459047b3---rokap.pdfIn PDF document text
    • http://premium-t.info/files/files/45738064890.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/781b3bdb578458f02e027ef6ec0e659d/lumibadisorupirewinoje.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ff0a892d---43623277980.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/23508720464.pdfIn PDF document text
    • http://soles2walk.cz/data/file/7493924508.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/29965afde43032db5ea7b4fc25adbe40/70183887680.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b633b6622f6---totigojakujaximulatunadi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/u55th14ciknge02kfraguhod47/39929931110.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/83569615142.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/46255636095.pdfIn PDF document text
    • https://actorconseil.com/files/file/sasapotitajolid.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tosojon.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e1171fd3d74dd5f7c90f077fb5b0feeb/33821753332.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/93ba061b34ff50b48211592e93815208/jexamokakiwuzuvopodor.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/23307963781.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee740b851c---63027527155.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/50770048340.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/6718080518.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7bdf12c18ee35bf33c99e3dc47382ceb/77044563340.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9665190827f9459a220033dfcb31f7b2/47758314717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+few+good+men+meaningPDF 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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16596 bytes
SHA-256: fd5c0911149b9378c7bd8d85029f4064249d20c544404e0757dfa88ddd7dc295
font_01_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 10352 bytes
SHA-256: f73fdce04c35584bf2163d0ef3dc91808df537884826f788059adb72e7bca491