Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8bb27aca24829…

MALICIOUS

PDF

85.0 KB Created: 2021-08-03 05:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11163bf5603d2f7362fe733f8fbc6a8c SHA-1: 27620d07208afedfcc8feb2ef03387743386fe66 SHA-256: 8bc8bb27aca248299408de855b458a9b9979fdde0f16d5cdb9ab6f6b19e3a79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c986ea8573e6ebf6946f5af0a8c9c703/96546363849.pdf In PDF document text
    • http://oumkua.com/userfiles/file/87659142404.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2709fc84a775450e45e6bc9276ef996b/nopadulelezugowinoz.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8ceus5r11r02ouqvrvbld6dt82/34627418398.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc0a2097a---51319363757.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210728_4AD37A66F2873305.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/34aa45b28c347e73e469078e66adc327/puxute.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160def104ef01b---dunemu.pdfIn PDF document text
    • https://bagstyle.uz/images/file/97803618470.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/levokewoxerivafojoxak.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/kapopa.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/25512198915.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/lizujo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/90611233145.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e92a543f---pavuvelubufetitogofu.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rbe5nh3njkr5ln98js7atm6gff/lutubikediboda.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/81f2de7960098ffa360396c731cb066b/vazug.pdfIn PDF document text
    • http://dienmattroigiatot.com/uploads/files/14555135048.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/bufaxilabuzasi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6ce0d6e4675a1e74c4f11e50944c4cb7/26252078835.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kri2t35b71ktrqv9lam7pvcvs/83259060586.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/66bcd81298e13f327ec7988387bcbdb2/riwita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=raccourci+plein+ecran+premiere+proPDF 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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 19244 bytes
SHA-256: 8ad7d600af9628984100b74a5a479e52baa52e6b6b0a7c68ff45e0d9e8717584
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 10416 bytes
SHA-256: 6a350192c4e0e93820536ac0fa0596e91854ee6249446ebed798330720b31ee1

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