Malicious PDF — malware analysis report

Static analysis result for SHA-256 17236faba2c78cea…

MALICIOUS

PDF

90.8 KB Created: 2021-07-07 13:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c410524034b91dee6603c3a0a820fa5a SHA-1: 082e51c6e19ff6057a61eef4451256ef39fd914a SHA-256: 17236faba2c78cea139e455793346f58ba6c84dc8e7045b8715222a2f6a3cc52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised WordPress sites, likely intended to host and distribute malicious payloads. Heuristics indicate a link farm strategy, with one URL specifically mentioning 'driver booster 6 serial', suggesting a lure for pirated software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://synerhu.ru/uplcv?utm_term=driver+booster+6+serial PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52c4a307d---gadagevuburubipupov.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/lufisenibanekekuwupax.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3580ce39d8---pekovek.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b60b643c---nijibivir.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jvr4q749n0bavrvbck3vh7edv6/mixixugosevepawojo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe1652de2---67909101537.pdfIn PDF document text
    • http://uamarkets.com/images/file/7079358611.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e5abc943e---nosiposefav.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tunokutelojatalijas.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c5c9ca4d3c2c637cfb973ee01b32ca5/jobijimigunalovowusugivo.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ef585e60---sinigiwisenorujigikafif.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0325847a79f41dc22e59554015e06974/60524951877.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/21244821684.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/kawojaxusetaguxe.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e1e621f761bfaac6069d11a0d946cdb1/sezumeximakowigulelanut.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9h1ukui4d36114af3v5ah15fra/jobamiv.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a079bb8d---62822615503.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/971328561d14fc37e21a571ffeab2a82/25426244587.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tvoigjcf1m1ncuk8gb7gomdu6d/xawetizajusas.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/xokuziganuxene.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/98086405329.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894dadc1ea3---14068732564.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/teluxuga.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10372 bytes
SHA-256: 6d0a127bd1583d523fe7b222a5557ec36a6c63719d67bf9af0e111f4755b88e1
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16120 bytes
SHA-256: 7cd650be26d854cfe21f1f4aada2ddbde382329d501a276ca3f46bbc947f3b5c
font_03_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 18832 bytes
SHA-256: 003d0eb0ed00d45fe70a167432a9795b9430a73771bacf42833075b3d473444c

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