Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29e8d07bad05652…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 13:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0abaeaccbf596e56c7ccf695e9531e0 SHA-1: d7282d9cc2a7b45431d88427d3db3003095e9b37 SHA-256: d29e8d07bad05652c937a66052ed7b93c75b58e9fa699b3678360ae4f53414ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URLs, many pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to obscure the ultimate destination and potentially distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://irlanc.ru/uplcv?utm_term=3+digit+division+worksheets+no+remainders PDF link annotation
    • https://33mobility.net/uploads/files/jimovepovupora.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dcb4ba4b73d6c4a0d77846820fb37d1/senedisalelofolikoramibu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/17138356085.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/79093638124.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/jitukitudixemudibanutowa.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607667b1529b3---33880706812.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/14686485603.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/67829753819.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/36178127848.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58e4586cd165144dba3c6d63b45ef3cb/wiwukiluxowo.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/voxarokivupefaxikefe.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/tuwefawawukulev.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd661f07d---86617912537.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f57aeb395---19234849138.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/luvopapupodi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0d377e168ff5a9d595e80fd65a8f38f2/jopozirelisup.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/vakebanaresufelu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/xuritokitebosaveluvevife.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626351725.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/82327505772.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/73170896250.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/xepafoluwuvamu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae24589ec2---mawomafazalodufupevegowab.pdfIn PDF document text
    • 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_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 10968 bytes
SHA-256: 1e1dcee57ff299d6f7b604de973e67ed5726cb2adbb05718a25cda50555e73d3
font_02_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16872 bytes
SHA-256: f59677cbf81b7c1f11de87a75021883573b563de41d46d505a1ebf1f22fe3335

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