Malicious PDF — malware analysis report

Static analysis result for SHA-256 5355090138b288b2…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 07:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 074cade56ba2c43de3c9b722cb843985 SHA-1: 4de865b70519fa6ac5f7e62fbcef7bebd707afd6 SHA-256: 5355090138b288b28ec9643f8a5ba32df006f138a1b897f2d7bbf6e490e8f460
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gbagencement.fr/uploads/file/53541405926.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba1d6097816f3d6eebf7f5ee4217dbde/gipamojawanif.pdf
    • http://zzzwchem.com/upload/files/92996069343.pdf
    • https://bustotoronto.com/userfiles/file/83321429931.pdf
    • https://aduanaldelvalle.com/userfiles/file/sixitazinesowerib.pdf
    • http://eg-connect.com/uploads/editorfiles/file///44012384822.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/765eiqhrniid6ueb261fd2qoq3/9041192934.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47808f3d2---74929284826.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512103306687353.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a54b52b39df95ebdeafb67e880f73333/lanununowodanerizufefajax.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/26ec8299e1ab62d04bc09ef45ad8ffdf/fozasilawifa.pdf
    • https://flyags.com/editorResources/file///tirudiwitofebozipezem.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8f78a30d---bexuvefokaf.pdf
    • http://farmaciafoglia.eu/userfiles/files/votonudidizaletosenabe.pdf
    • https://indianpowerliftingfederation.com/userfiles/file/4854855310.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/8187129398.pdf
    • http://danchrisjewelry.com/userfiles/file/tujurilitojubilajuvalum.pdf
    • https://alperbehang.nl/userfiles/file/kugazugomaje.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tazarov.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2779ad94fd0c14f5b46cc54b00bc2eaf/29331669716.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/seditor.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/84540725615.pdf
    • https://puppometalli.eu/file/25848542780.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=explain+the+symbolism+in+the+pit+and+the+pendulum
    • 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_off0000e09e.bin
e27b133f3e89b05ca7f7ffdc355ead548d5d639d17582206b16ca9fa6dfdac20
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 16352 bytes
font_01_sfnt_off00010ac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
font_02_sfnt_off000122e0.bin
23ddc2a639ae81f42eaaa72928e178268622fc627158d29ded1a8c9b4a76241f
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 10996 bytes