Malicious PDF — malware analysis report

Static analysis result for SHA-256 9083288154d137ec…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 16:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70615484984e74f479dad2dd524c7a27 SHA-1: 405059b318a7ca6785a53aa50d9acfa8b7bc60e3 SHA-256: 9083288154d137ec7035e08d91faa99c4d8c40fe045e1ad4e5e27e201aaba91d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially compromised WordPress sites or other suspicious domains. The document body is unreadable, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c8e206113f27aabac4ed7c8f995d7a0e/73155041843.pdf In PDF document text
    • https://elperrocallejero.info/ckfinder/files/folukebadezavarefaw.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/33017386805.pdfIn PDF document text
    • http://hanauhrova.cz/files/60670083703.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96198611588.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/246443054.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/dalonesux.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zirurenorofogilo.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josobobisifozogelagele.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/kitatopilupipa.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/30363777069.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/67243054004.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/59235894269.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/karewekebu.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/68688320277.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/73384584483.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/92468184296.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/nifoxofalitot.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306957ab194---31374175458.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/48a19f4e25795292fe4c62b935147e29/doliwaminuvinedugufolaza.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4fbnsv497sr7f30emm1o9tkoiq/rejamunodumexasaju.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/zazudosewalujolerasepixiv.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/fesij.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/maguwonuxirejusanuvuzosad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acf2a8a72---legafo.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/974628066.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/87397257108.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/13462657344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+web+system+view+apkPDF 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_off0000b8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 15956 bytes
SHA-256: aef5ef680fb602d2ea750b468eae715573f749175d6a8effe9f1e1dc3b609d32
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 10984 bytes
SHA-256: 6ac6c98b1c5dd9356abfc22b0a909156ec548fd2669dd0475dcfdbf5b6cf085e

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