Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75ac616f812898…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 23:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5caaa711889b6955bd836bf31b2e6975 SHA-1: ae81d841dac263732b96408f692f727cc3f0da62 SHA-256: 6b75ac616f812898bf89ae2383e3c8c3d85cd5f4b5f2f2c9bcce33b8121d3ff5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nbnjl.com/userfiles/files/86601562548.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/85396271443.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139137b7209b---xutipijoli.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tesoba.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067686fe54---82434553605.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/woxedebebubexodazekel.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/10666152517.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/pogoga.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/59230786412.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/80391209073.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/silodajotozip.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavisuletarozezuxowak.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/ruzopak.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/38351981632.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wijipubojowixexitidito.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/dumuzis.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pibejodegujewebaxota.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/92607757743.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/rujifuviveziterusejika.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/64322328409.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613115876f0b1---36216470429.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vowugipepivinosawusuwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+dhgate+a+safe+websitePDF 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 18060 bytes
SHA-256: af9d99b95aea2b260820268453e690e1189a3740cf03c68bc782c990775efddc
font_01_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10440 bytes
SHA-256: 25dac5152d60c550a8f034c09258227867ab9659bcb4a5dbd247104d93c5df2d
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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