Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0984d61ad99f5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-24 05:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12efab67ef64669e499fdeec4b4e8586 SHA-1: b1dcbe4dc9ffdcabbca71f15b084f126796e62a1 SHA-256: 97d0984d61ad99f59f4c68257c8e5e25978364ee326bbf5c7151914c7bf54eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or revealing sensitive information. No scripts were extracted, but the structure suggests an attempt to leverage SEO poisoning or compromised CMS uploads for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146abd0ab789---44390557689.pdf In PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/doderoxezanoxatanaj.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109010431279051.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/91410715109.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea968f85b---76106220200.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/rowojufexus.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/6252020742.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16319961009380.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/31602830837.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161353bc44a719---90827996372.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/46089612563.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/dabutibovoxakurevu.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/bakokawetap.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/40597527266.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/79661492521.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210910111004.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613083fa5b0ad---nadefiza.pdfIn PDF document text
    • http://wawa757.com/uploads/files/ridafexadipi.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/jakisibapabomukino.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/48694735318.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1408251502.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aa+big+book+app+for+androidPDF 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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10444 bytes
SHA-256: 7654f88352dc785fdb0c7dace00a568d045273552410c8785683e756b66d0d1d
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 17176 bytes
SHA-256: f43049206cead25e4848606d35714d0c0eee939fb090b5f338be43243f7fc07e

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