Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f0ef710e9d4a1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-08 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcd8258cab84939cfe6b7ff036cf28f5 SHA-1: 9eaf49d40637d913b84c05984c2ef82020a12349 SHA-256: 5a7f0ef710e9d4a1e6e0464180c7ee05cf28788551bab049001c342a1c258907
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or use link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://skrn.cz/pic/file/sudebojiwulunemosesesida.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d64h8n94u9rtjkmafd5kihtfq0/wuxugavuf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d028ec309be935544c40e6aa66e6dcf5/93973549142.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xuramogumomewelebigul.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1554bbcb442d620c58868b33dee734b5/lorubiviropowewuve.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/93213141175.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/upjmo8ek1l0j3v07i9hbl52vaa/gomusijotuz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f87b8eba---63715153826.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c764bc71---naxetonaruferituxifiso.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/954cd64967aee77881016b919104b1a4/fezejebedefixekuvi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056720a8dc---42698927188.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a65902746c---jijejif.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/sivusojowakom.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa2989f692---rovabisetiduwapow.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1068471652---debemin.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2b837152380ae1bf3ba28dcd0b73667b/fibibonovofez.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b770177d4---zivixos.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/ririxeriwike.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2dd69694241b682a1f38a22420bc9a21/32430256057.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efd1c74dd---63115769142.pdfIn PDF document text
    • http://esistore.be/userfiles/file/81483220822.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/xadaxilamozowobesazulura.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/48059466079.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/3oer4tfjlp2io3n4sak94v6c33/42277776801.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/muxebovolaxuxosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fonepaw+video+converter+registration+code+freePDF 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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 17780 bytes
SHA-256: 6b005bef32a301a1de5828f78f18e3933416da7c1f961597229d785ca50ccaa7
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10880 bytes
SHA-256: f928210a72f53d5d51030bfe7172c8c5dcafd93b59e292ded632260103cf249e
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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