Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf9159afc1e6d35…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 15:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13eff6df93fb71c040527daa062295b9 SHA-1: 0e3c7834da4c88af0033d55f81c80a959c42eaa0 SHA-256: 0cf9159afc1e6d35d227b8d3ed48d2ecd5a5c7d286ada8cac91f1914d358e5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, such as phishing sites or malware downloads, as suggested by the URL parameters like 'nox+security+premium+mod+apk+download'. No scripts were extracted from this sample, but the structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://chcial.ru/uplcv?utm_term=nox+security+premium+mod+apk+download PDF link annotation
    • https://zibarajabi.com/cache/fck_files/file/49978866788.pdfIn PDF document text
    • http://apothepharma.com/upload/files/sifepaketibesajima.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/wamibusuwe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134afc4d9ab1---52536511385.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210912_CF06766E75BE0962.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/60091309073.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/ruboropuwoloza.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/difapuwumunon.pdfIn PDF document text
    • http://esistore.com/userfiles/file/22289430967.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/sugap.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/83019718317.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1ef2eedd7d6a4f8d19f352cbb9e87f9/6524116411.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/venamivafemaxilaw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2489261f6f10d3e7f33efe8665187228/95514897235.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72a6e9f39b9ff972f486e0b2163ecbc3/68080557358.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/58145897223.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/togep.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/92600260752.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/tipewuxikefitumumomiwix.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/76230856002.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/bivezijadar.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/31282595602.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/tosedagejilozukedejuteg.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/pukisul.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/90659703971.pdfIn PDF document text
    • 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_off0000c141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 18236 bytes
SHA-256: aa41d0fbcacab3e8ad1628360a89851b607895f14dbb46ac57a9ff6abe729eaf
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 11144 bytes
SHA-256: 8e0d22ed2256152b3320b137ba5e78b9da29421c0f51bf89962bdf8c37098c51
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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