Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab06d0b518d359f8…

MALICIOUS

PDF

125.2 KB Created: 2021-09-06 10:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 734952bbc7bf390f23b60e1d0df2f600 SHA-1: f16fb15c297d74286481637802b7c8c497e16f0e SHA-256: ab06d0b518d359f8d1cf8a747078a3ac6a0bda6efd26597098fc1bb14c535173
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baschin-heizung.de/meineBilderAlbertGrundschule/file/88394733540.pdf In PDF document text
    • http://sdds.be/userfiles/file/tajamizofupufefadijorixe.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damorivuviwawino.pdfIn PDF document text
    • http://gysanya.com/upload/file/21082504052644860804wa1bsly8n5.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9bfc757816f62b7132622c4d29d9e4d/mufinuzozupuwivaw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dce4cbbef65d7d2a1cdcb97fd308e4ad/worodorevekixoworulusufaf.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/26658504529.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74634b85412a378ec72710dc6fd71bc7/16031041932.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a131247a7d0---losiwubegujodawojokazobi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zabojokerakegasaleweja.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084480018e0b---jesobitagogujetoxojo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ce9283915c339b15b4f6a9bdeeb42cc3/tomasidil.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cd2dfaf1917fbd593c0975f2effcb2a3/dotexizulapiluzisolulu.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/tegegizoju.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84f3eae1f---60483646250.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_191917.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i9uiece512bv433ns6nopslgb6/22815775992.pdfIn PDF document text
    • https://webmenuplus.com/images/file/85019516988.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab546748952---faxadilixuluzawodobig.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/28469742068.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/22993537889.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47d4bd5cd---meguganolatoximex.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ed84bfac---11319090187.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd613b9f85---wekijuvazudusemadepujevu.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/51856849252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=newspaper+article+layout+pdfPDF 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_off00017e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E5A 10788 bytes
SHA-256: 85a19f17b676b7d2f21ff704e02035e4ff39c06cb66c74bd45bfb51c664fe402
font_01_sfnt_off0001976d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1976D 20784 bytes
SHA-256: 207317ee33b7baacc27e7a99df2a67cbd10c29ee7b1788edacf59945cc8648b9
font_02_sfnt_off0001cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1