Malicious PDF — malware analysis report

Static analysis result for SHA-256 366884655527dd13…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 15:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75628255e592d70c2d468487a362fe49 SHA-1: 3e3137440c7daec0274aa4b358097f597d1ec419 SHA-256: 366884655527dd1313e42d957585e9c447dab21e8c7d43f3b1b31ac0fb1d2b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://radio6deenero.com/uploaded/files/5745717126.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hcva81353rt434ejnj9gmot10b/kikinexavebofukorumakej.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/90mkjl6rd2v3djqt3mocv7ikhb/rubuvesop.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609838be25d75---68478663277.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e1dd12103389cd763d1679fd41ecc096/dexotakiselawonasagugejud.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce105ee56d---37005650418.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/koroluduvonax.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a752e54369f308e35da502e33ea2d8bb/43432634088.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/goresa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/woxidakinipela.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e6ae780c---fepubasep.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/18699414979.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/ruwigoxilijafovibajezera.pdfIn PDF document text
    • https://papiratisk.cz/soubory/43212362870.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/piwevosamevetaliz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3b1d94ee97b3b36efd79a684bf2ae64/78091876961.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fimob.pdfIn PDF document text
    • http://skncn.com/u/files/82820478741.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4f281dc7fbc1baa457d89d599ac31b4b/pasebudezij.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/volazelu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/winebut.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d654455f2f---67219563923.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20f79219f5ab5e90c777ae14ff55dde/xosasodeloditojedes.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/341438063.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1gtn3gk0l0j4m1j8eu6m3qsvc1/16577240971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+compressed+watermelonPDF 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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 10860 bytes
SHA-256: 4d031876900d43f753c69d9b5d18c0ec3968b565805b9abbb90aa065c47f690a
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 17132 bytes
SHA-256: 2bec7c8e0db890ff67746a4588dffb1cf4d1538ab9329e5e2f3e997beae48189