Malicious PDF — malware analysis report

Static analysis result for SHA-256 90426bce7e3ecf36…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 15:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db2f067bb82f846d04f902616cb4114d SHA-1: bbe1002d4c9ea0017512c5096cb7af6ba31c2df8 SHA-256: 90426bce7e3ecf360d10c7b37ee5f30160569600dd6f2618048ee86080501a7e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable binary data, suggesting the malicious functionality is embedded within the PDF structure itself, likely through the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://ipost.mn/ckfinder/userfiles/files/18684032741.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86262364288.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/8268760353.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e90f494f1---20630850343.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/nujotekibixadido.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8df04d2be17289d35228f335e60b3e26/betazizemijot.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/sojakixigu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ladeginirumuzigur.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xovizubumisobokewo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba10d351a---87896419204.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/ferejojiluradizajoxav.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/bilomorux.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0aacc3f53---38590752428.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vemojonele.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/ninapodafejosor.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88fd961fe---gojitamewinemojomadojede.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/de0b772237ac81f0ad154ac3e4e7cad1/zapobavejaminadofumizi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1d3f0ad3---40310523421.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/e3e7e25a35b4edf721f23dcfd872fffe/rozifimigokozufenejirar.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/lobekasajubokupodexevab.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9319a9d0f7---24609188734.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607345ffd4579---darevoza.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c710e4eb---64326848704.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9a1ace0b9a9667c7eff602efcff81e1f/89600871561.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/7183782148.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/43393263340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+to+base64+android+studioPDF 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 18596 bytes
SHA-256: dd7648bc24656ac64239641706abfeef4393f2fbac9ee9483f8eab7367bfd996
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10788 bytes
SHA-256: 5b511c340194bb1b6d9bb3a3de5ffa3c44526e889670a474f5a7a0adaecd6d5f