Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7662b747b41393a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 13:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3bf926eb6aeb43cb4fc12d1caa219c6 SHA-1: f027555fb9623ee918f0706134585fdd158bd52e SHA-256: b7662b747b41393a1280e63838ad617536f318c8bc57129d45d0d8429ea86889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://coretry.ru/uplcv?utm_term=the+wolf+of+wall+street+janet PDF link annotation
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/75323890040.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877a6b8b687---kopariwolazulizixenofar.pdfIn PDF document text
    • https://rosycaffe.com/file/75197479871.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/dinebul.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/v65anbpbmuusni6r2pb6hck8v1/voroluzedafafaroko.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e776eb93---20438448494.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///79451580249.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/28afa23182cd94096d375cc3e49b09a3/kakorabije.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/aa40d9bc216eb2071bf8b7abda6d95f4/leduviwexibefobiba.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/gulikowugeroliv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893cb6c473---zegubad.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e93b7896d32373c87e5b3a4168cb901d/18235724117.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/14d2d51912d9f3bdeb43c5d5200cae2c/87465040874.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e309fb4d26a448c429299d3807106802/suvisowunigoz.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/95271616832.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/459c7a89a54f1fe6114022bf288cdc90/zasokuxikovip.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/88195097458.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/famalamudipiroxezifebo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6db7f513.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/eec7814af5c01a3521fffc1933475137/penumofobokizofenivupasus.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/95edbeca0e66cd73d7d19a087bd5b24c/wafifigowezakoxivuru.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_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 17584 bytes
SHA-256: 02357ed71648d9deca89d9c32b8c8f97555882466ccc78fb1e39329f47ab335c
font_02_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 10396 bytes
SHA-256: 4ebf46692bbde6c6f41961510da5466a8b5764d94a897f55a5b896dd922d0352

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