Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5922b232fab1e5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 05:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba4b52ca599cd7d10b68da3adaebca31 SHA-1: 1d4a0179b46d24baf284bf144eb2170bcf3e7226 SHA-256: 6b5922b232fab1e5d345a129f634e5d3b9bd7014730847b6e9bd8e42768ebe83
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially untrusted domains suggests an attempt to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://imagebeaute.fr/userfiles/file/zenesebawilajefiwativ.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5787f6ab---taxiwuwikevawag.pdf
    • http://euro-ex.net/images/blog//file/borekulefi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4cc96d79---8568891404.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160946de8b84d2---54871244358.pdf
    • https://hmanagement.net/userfiles/file/56729088145.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5ldmj8er9gp0cuftumfpvcdck/pofovijuzaxixegi.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e2391cd0b2e3896292220d3489a09a5a/48092824979.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fddf0327---fojepokuk.pdf
    • http://longchimvac.net/app/webroot/uploads/files/77560097942.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a34154b78---43174499602.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160744af041b86---94468884889.pdf
    • https://n-v-v.dk/userfiles/file/2990480069.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/iomllv9e0p1jb3sgqi2i4u3mjt/2643416966.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea9922981---59758516756.pdf
    • http://sinproval.it/userfiles/files/zezabogebukaxejawobifer.pdf
    • http://ottotech.center/userfiles/file/79865881650.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1f5206c1---metesawaritexabarojaturu.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29f115eca83afcb234b433c80171801b/wezefarodivakuxobu.pdf
    • http://asustainable.com/global/file/58133631795.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92bbd710ce---48372644769.pdf
    • https://igruppe.no/ckfinder/userfiles//files/dekiwewupamuvuw.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947559ff6---61402629458.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+graph+a+quadratic+function+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 16792 bytes
font_01_sfnt_off0001029c.bin
a2571d1b494c261f79df557a251c4d42f9069643e408ff87c604507250c12ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 17824 bytes
font_02_sfnt_off0001319a.bin
4049c1073fd7b4e85d7dadcdf576b0cafeb0fcf8a774290d5ff36f8b16c6e107
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 11156 bytes