Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e73adfa045caf…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 05:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73963848b9d0bdd765f98e0903f7a8df SHA-1: da8fc0aa056bc497b1faa3c4064dfceabd05da75 SHA-256: 440e73adfa045caf29d2fab5a21fe4bca2d5b8e0829f2e0fcd41183cefdc6ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cb563c2---dolov.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ed9281806985cc198ae745c98a2570f/wawitigaperav.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/31302902039.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/74449000231.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/96023373394.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e9f082961defcca1198db6f44c3ef15d/51596733008.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bcd0dba4---6666135572.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/56200286188.pdfIn PDF document text
    • http://ktcz.eu/files/files/kapaxifanusupopikozimibax.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16cdcbc9d---kimepowoxiduxukozalunek.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/d05226d3grgf9sb451c2jll411/tupuziguvojuwone.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fidimifipela.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/j97mqqiqg5qiab1lpnfhg55024/nawad.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kitopiso.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b623ae8c672---37246832650.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210704022205.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40334b50a5---nubanobu.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18453612093.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sajoxugajakef.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/bepuxegifik.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f447442f9---91573217299.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f3f8540d485b55cbd0341d0166b8571/wosuvigaberuxal.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zataduvovisugawapusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dr+dolittle+tamil+dubbed+movie+free+download+tamilrockersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 11120 bytes
SHA-256: 2caa59892818b4e5573f422d956f60cf02184ebb55202962d2fb932e6e87ca68
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 20784 bytes
SHA-256: eceec4a170c730ce57faf227602c1d60dd90e35e3fcd286bc806cf350fe43a3b
font_02_sfnt_off0001362e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3B 1884 bytes
SHA-256: b996e8b46bcf38e0e0c9bf1314819c3b11e44fb350d0af4789ff89ba77f8c2b9

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