Malicious PDF — malware analysis report

Static analysis result for SHA-256 902b07194171002e…

MALICIOUS

PDF

96.5 KB Created: 2021-06-28 00:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05fccca149185062c9862e2487208a1c SHA-1: e855babfce2dda7cd494408fed5a3cc6c58364b6 SHA-256: 902b07194171002ecea7b7844a050c021fb845cce80e6e4909d10a9cfc1b199b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://ketchas.ru/uplcv?utm_term=what+is+the+past+participle+of+seek PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e924cf0192---tusapub.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42f688aa381cda42f4594dcd2a7afb88/pibagi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7086e3870cec655f58407967b399680c/disidogumubajuferikaros.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kezob.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/81055de924fd513aa4a95d5a0d167542/68457816990.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/9246183811.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a9201eaf6f1fec3287c773633fd2aff/60660125868.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rr2klhdgmcmbr6i1sm0ath9te1/kidovebidiridiza.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/gesakisopobogamolinazute.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33db99ad85deaf2459ca418760656434/34878675261.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91581e3502---zuzuveneto.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/csdsl4aasam5ll8hlqoc1d5ut5/43555491001.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06aa3efe76---73164861944.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/12f926159173cb828dde894a3cbe7b6a/17336179686.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79dab66409---japiv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b33bea18---56475894519.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tugomudabosepozovemo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/435582948911621058075.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/maloduziruzutisonepejaw.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4737aho90ql8l6oqahdgdst5od/70759960798.pdfIn PDF document text
    • https://activepymes.com/pub/file/15141251716.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/muzilevafunubonabap.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/89346463430.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 16364 bytes
SHA-256: a0c30ff427893039114db1825abae49942326f70848e6c26b6cc17a9852f9dd9
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10560 bytes
SHA-256: d4ded3635aea2bdb93f87e9d5ef7ce949f6a4747052a61a3db8b0b68204d0d19
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 3640 bytes
SHA-256: 26a02283dbb6b1b64faabe839c25aeb905031b45a3953214722eef2c78500061
font_03_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 20424 bytes
SHA-256: d5988dcacbd1cab54af47cd43861e473db4e8a22adc2c51f8e58829cba51b11d
font_04_sfnt_off000159f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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