Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd78a0d1f7292ab…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 21:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f93216f5a2c5a74a3f2299c5a62df2b1 SHA-1: 8068bec9e52013a1bf79c2b0519b9db13733049f SHA-256: 8fd78a0d1f7292ab0fd8ad3f6ba257e454a0728c0a3197142dc63a7137cb99f9
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous links on compromised or disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://mnogonomerov.ru/uploads/file/boweza.pdf In PDF document text
    • https://drddvichitra.com/userfiles/file/judaku.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vufixatovolawitibul.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613803954afac---27480746921.pdfIn PDF document text
    • http://olivermilk.vn/tctt/sites/aaa/file/30630369761.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905014440932986.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/53935843693.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/vedof.pdfIn PDF document text
    • https://servicepapik.ro/files/45155433903.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/niboveji.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/wokadisazumefa.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tevomazosi.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sebav.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/21622372919.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66823078165.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac2f2731f---42135572865.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/59498992555.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/27363159717.pdfIn PDF document text
    • http://rhondachem.com/d/files/51703994331.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/18536303819.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/xefonerogebidibexojis.pdfIn PDF document text
    • http://sbairs.com/datas/files/27787420716.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/86405093381.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dedevarujokuselosewip.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/leleto.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/nozamumukili.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534d82df3a---91802280918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mod+menu+among+us+apk+downloadPDF 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_off0000c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09E 10716 bytes
SHA-256: 7c9275ed1abf7d5bb264c5fead28ba9f3e7bd1bf06882738c92e3bb7e53ff3f2
font_01_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 17316 bytes
SHA-256: c767671b829be96c31c08eb4aae011dd8569e55b299e08379f2d4713052d91ce
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1