Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a58e31d7d879a9…

MALICIOUS

PDF

84.1 KB Created: 2021-10-08 02:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c41d928d62943e33ed85b86bdf43c88d SHA-1: 424808d5b46ac7b52c43eb106938c75e04ef290b SHA-256: 16a58e31d7d879a99b18f885b8d47dc381995dedc933ae4fac34a45813624f26
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, some pointing to IP addresses and others to domains flagged as link farms on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://detikakdeti.ru/img/file/9759663759.pdf In PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/kodaxutaxonidixo.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tikawabuvekakaridiwo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210922155530.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///rifizonixalabisuwilivavir.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1ef741ba2abcf048d62931ba77aaf2b0/95780449533.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/42997579260.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kuzeresal.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/jezosobomivuj.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58249277855.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/titemijepugisapitaga.pdfIn PDF document text
    • http://mcutech.net/files/77484068134.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_171329.pdfPDF link annotation
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/96661654966.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fbc21ee53.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615c6346619b5---10487001707.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/nudilew.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/jexilifejemid.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/liwirajozule.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/dipagoxetufixinikozewoji.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/30447711832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+long+does+it+take+to+fly+from+ohio+to+hawaiiPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 11084 bytes
SHA-256: f882eb34e90a6ca8e30a822af2c75400720ebba8c51f8dfbcc221a5eafd0e1e8
font_02_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 22312 bytes
SHA-256: 5a9669369f33a904065ffb490342e64292cf9a82814cd1621eae48551153723c

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