Malicious PDF — malware analysis report

Static analysis result for SHA-256 419ee357fa14fed8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 11:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c8bfc4011ec8a35fce898e5e845d934 SHA-1: c9cabf781e6128c56200704758656e4f6bcf20f9 SHA-256: 419ee357fa14fed87835c65fcfd672dc83a3eeb794a3a44eaa75d68b9b9ff092
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristics indicate it's part of a link farm pointing to compromised websites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 7

  • 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.
  • 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://poney-club-romilly-aigre28.fr/userfiles/file/13475381161.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d9b0b0a2---reponipeninogadanijowij.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/18945016678.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fofuvopokin.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979092a521---legalajejopufuduf.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18511961330.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/74490625214.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/nomavinavusowan.pdfIn PDF document text
    • http://rentaruedas.com/files/others/30761977129.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/nekewebuvonavexobusofa.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/jevakasafotu.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/73057744461.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613764234c865---fuvaroxijux.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/27119149010.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/91203060214.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/30998655743.pdfIn PDF document text
    • https://udruga-invalida.hr/files/gozibivosevazekujozetude.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/68199329309.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nuwelolilakexusefowolok.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • http://soupworld.de/upload/file/tavijelopofijejafifipuki.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zizujawejajoxepegetug.pdfIn PDF document text
    • http://cityfate.com/files/files/loredilife.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47261718f---lofolojasovaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=batman+zero+point+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 10556 bytes
SHA-256: c5a77fa7f28f39f89151bf1b7143dd88310a516ca1cb137a42ed7d9112019277
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 2128 bytes
SHA-256: 57e0292be3dae69396d24eeb93d5f695b45ab015893fb967353d758df89f1456
font_02_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 23740 bytes
SHA-256: 208b01ba79b0ad959b45f881fa8ee2b07f4dcad9d9bf2b2d260388a085f8bbc6
font_03_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 16512 bytes
SHA-256: b20c8cbb10627b23b3a3061103fbdaf746ba3cf8b19c3e214858cfa788b67111

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