Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f0adce398c8d60…

MALICIOUS

PDF

101.3 KB Created: 2021-07-08 08:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f32a3c306d87ae8118f8082a5f141707 SHA-1: 5bf8449b025c0eca81a6fe9f55fb2fdba3e53c92 SHA-256: 02f0adce398c8d604c6af806888f80c82b1ea07cdd582d23b2c4562e31c4cb9e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or distributing further malware. The PDF structure and embedded URLs are consistent with common techniques for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7k72bimbbgct8pkskr4d1iib5a/kurenimibafakopu.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ecfc049eae758f9131e74068371a03dd/midutaxib.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/47f1920a630c3d1ad2949afde30ac546/83819826569.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083253564c00---nuwinafitunozipepu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/19950188967.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qi8ddks9of6eqenb81i4pf9071/70477093273.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0c44ef3e---64432402459.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870e2e9b3fa---68851021579.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/zukupazovosowosawuwuw.pdfIn PDF document text
    • http://chromoink.com/updates/file/nusajoxiju.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/rolabatej.pdfIn PDF document text
    • http://blueyee.com/upload/file/16064210473.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/51327467415.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/64914440070.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85544310d76b62feb4a06f6b258e4f61/romudibufakabi.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/tagilutejomuri.pdfIn PDF document text
    • https://unosms.us/userfiles/file/5478824649.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oc6sl5apr89hq47b1krnlemp1q/zomidavusaberobataj.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/781890cca16d09964e42049d91aab55c/12119972947.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lb8kfmmacd3q0bpvk82ltr4sr2/61119959683.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q4otdpcv72vh8ltteb75b7ili0/99096042475.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/02fd10e17b82587ff1bbe14c97393cfc/damapowelivijatan.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9cc9c1d7d---81433443825.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429225106197208.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b109aae8258---78033444288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+free+pdf+editor+for+windows+10PDF 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_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 10596 bytes
SHA-256: 202dfeb126ab3dc3f9a01aaba3f4d652165cd894720447289020d6f24fe68cb9
font_02_sfnt_off00015926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15926 17704 bytes
SHA-256: 6d9d41825f851df72d479b4508abdeb865bc56648663a1d926cc0ce697093f9b

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