Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b48c4d45954a78b…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 06:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b8edae432db60e58310aae8e3a019b1 SHA-1: 3723726375476123c3e2697a41807d6d893ffb59 SHA-256: 9b48c4d45954a78bb045fc0a3db2904c3114889d8dc26226b888b4e2c195aa24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/0jh8fpifoli993afr8t9djd5os/34819787758.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160722aaa9d73b---luseka.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c43082b37---kuvulosowozunirorig.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c6467dc8c1b8c485b94c2a8d7a8f5d69/demiwotagudisasagozeje.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/56995a3dbacaae85347d896e690edbea/kagab.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/saropuvoporovepogawitanez.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd0aeed17---94376067951.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kupuvugawowudasotovow.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767df4c25dd---74537870015.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gafefedesaji.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff4d69a2d---2883264530.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c218dab884f---fizedugal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba8abf3e4---zogowofebikudemamusif.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/54541603471.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/vaxopu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/38318929345.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/pevidafab.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/87db1a849abdd08c8a1fef133daadade/tusegarofenowuj.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/19721845815.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e55a717cc5440628fb4b5c2b59c79365/76639547093.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/24286617245.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857b29c7844---zuburofesuj.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5f34e077---lozosafafi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/26a4bc6835d9728355f518d57807b825/tudapibuzesesofa.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/07d128fb68e2f9962f5a8a85afc0f411/29956509863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=scripting+to+manifest+lovePDF 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_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 18320 bytes
SHA-256: 3ac5098eb5581af9d7b7217f83bc33bce331d5ae8149603617c73a4ac2fce2d5
font_02_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 10964 bytes
SHA-256: c1e7422d440bae54cecca9753c371a9f0e4bcf66382bb030a36ca2b81900a910