Malicious PDF — malware analysis report

Static analysis result for SHA-256 456ba65d5afcad45…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 22:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c22c3fa2c7cc18d97828e72562ea91b2 SHA-1: 0d59ee9cf769e737ec30b22a66d88e4330c078db SHA-256: 456ba65d5afcad454cf3b1db07d7984060d18a9eb7bbf661ea05730728a161d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a3c7daa7bb248cc8ec9a611088031c31/womefizimowufarininumux.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wodijodupajed.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/wupukafufufaxowisib.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350681c8f31---78994780221.pdfIn PDF document text
    • http://8njl.com/userfiles/files/gatifeti.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bca4c8c7---35248847558.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/60831715425.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7f5924a7df50bb81dd573f06440ff7c7/94574163946.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/zuwixal.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/petalasimikesexudugedupon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bcb4b4259---73733177439.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/58165965130.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/zijipefu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/goloropepoxunirosebiwo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/39f31ae31a1e695890d9972d6cb5d699/wosekore.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/fadised.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/lebosino.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/55333391584.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fufexovuxarenijogagu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/8242031999.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/85552180003.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dedigixeluxewu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/darafugotezuregen.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109030950435028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+10+pro+vs+a72PDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10960 bytes
SHA-256: 90b5f6ae1759e28b8afb0cd683f9e4a7a4ffad64c05069a68c693d37bb58eee4
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 18636 bytes
SHA-256: 6388638df39a9604fb52cb2938a35e57c0218709137839f558a52a519c958a0d

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