Malicious PDF — malware analysis report

Static analysis result for SHA-256 927775f29d7de832…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 06:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b6fd730053992f60df5397f5ce05517c SHA-1: 97b682b568ade1c0610395cbe9a4a5631fdde2f1 SHA-256: 927775f29d7de832819bccdf3c3c0ae55840befd0bace231e9c185d863bf51a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ut1kpmssoqo3lqcfr9jtnh3k88/mebuze.pdf In PDF document text
    • http://diysmart.net/userfiles/file/nefisedeva.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ff99c6f3---91233019770.pdfIn PDF document text
    • https://promise-land.com/upload/file/sezowetasap.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2406a0d09e---13855972919.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7a2323e5cc66b1587ce199c366339dc1/nerem.pdfIn PDF document text
    • https://saam.vn/images/content/file/vireni.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8979b0bd94067473e77c7acfb060b826/37121703282.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/80565011814.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/di9eods8v43ofph5kgtlpe1ket/feferarapomewaluxupanig.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wisutetaruroreb.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tojezede.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968d8c5551---paxetapizutelizabezuj.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624592749.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506221658902.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/au4ol05iqgn0v29t73j1befrph/lirusenufuladatimikeru.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/22510302832.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9dc936080---kenibu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607419f86244a---93175300130.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/60849879369.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/73546557322.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3ff279b698d35f88afdb1a045ebe16dd/66168382363.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/86047396002.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160910d90af122---benimosemipepapit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=authorization+letter+to+receive+documentsPDF 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 17192 bytes
SHA-256: d8ba0c8de905a79e0ef2dc9ae9702bb9af16cb3af5cb934b91759394f64d73d0
font_01_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 10840 bytes
SHA-256: 1ce856e61d4dbbedb6026bad5b831be2744b7da03d189e4a32e8dcc40203c36d

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