Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd911a20429b0cc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 04:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5abd8ec655fe111f10cf65c93c9e1e36 SHA-1: 060482cffd1989cebe93e1b5a3a9b4e6ae0ba6a9 SHA-256: 8dd911a20429b0ccb97ab3fd33758c5be3e84d99061b6e4310036e4b920baa1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ymmicro.com/files/files/51292152400.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/67342547035.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cf5722a95---wireforuje.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/21065692937.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/18798188175.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/felet.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/jebofekodove.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/4225352476.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/b91g9atn37g4nc2hk6tlahlr4a/77169357026.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuxig.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/355878356.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kq9u94p70hj3pte9lrg1ge5aeg/barulowase.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/44021752645.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/78793507952.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160721201c12a6---fununav.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/74757310071.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vezez.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/69886435822.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/19205379732.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612633eedcdf5---87850185253.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c4476a0d985021693e34916b5d5235e2/takexisunefep.pdfIn PDF document text
    • http://www.agot.pl/upload/file/tijezesonaka.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/90206978247.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e4dd8f6ff1579c9ee113b7228358dee8/80763669656.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2391bdea21---mowonelilupesur.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b1c8cdc7---28246636148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ipv4+and+ipv6+tutorial+pdfPDF 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 10552 bytes
SHA-256: 42034f6efbc00fdc024cfef1f56952fc000cd1bb4083530fa6d07d39d2704ba4
font_02_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16644 bytes
SHA-256: b464ed35453603d0b84701dda188e716552386b781e2dee044aa27cede6332d7