Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7948f36b9e9971…

MALICIOUS

PDF

86.9 KB Created: 2021-08-29 02:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa6d220dc369c8ed83a6a7153d66b190 SHA-1: e3deda1c9d2071e53d2d7ba0173666b2e6fa9765 SHA-256: dd7948f36b9e9971182a647dd0cf85bb571f08d5e8f1cefe43181e37774c949c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://tectrongim.com/uploads/files/dirabonizivenizifimezimix.pdf In PDF document text
    • http://wheatland1971.com/clients/25033/File/werezudi.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/36654544821.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/79650158003.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ffcb6862f7d75b677324b6a4c6ac00a4/69824216643.pdfIn PDF document text
    • https://chpcentre.com/files/file/duboti.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/jadixilaxa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd04832e0e---94669712667.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbc8f5d136---wibofizunaj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99654788572.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15ca9f54f---ganiwelonixobituvogezeb.pdfIn PDF document text
    • http://bakoca.hu/files/file/basutilos.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/zidibedesofalowed.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/lebodirovojopa.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/metubiriweli.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sorufunivazotekanitipofat.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab51dfa05---wulewukaku.pdfIn PDF document text
    • https://maturana.cl/upload/file/domigakisilub.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/64254704909.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/nisuwebodexefivis.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/wizowuzapulizamibufuze.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/08bcc01bff1c508f77c7f3232ca0326e/9151728396.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/636124b117f770708c5838a47fee4f47/74974958299.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/29736428335.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/66713150360.pdfIn PDF document text
    • https://stopserv.ru/files/file/leriponapimogodapifa.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/95451874172.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/24683800018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hypnosis+script+for+anxiety+pdfPDF 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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10772 bytes
SHA-256: 528bf902d2e87e2ef7b7cf4eda04945e169424a0b55f383ab538c98e80b9e283
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 18016 bytes
SHA-256: 0d23c1b0cfd1e80b3529ef9e398c1a25d7566b36d863c6d7911cc9418e09c19d

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